Free Broken Scooter, Can We Fix It?

a viewer sent me a note about some machines he was getting rid of. and this was one of them, he picked it up none running and sat in his basement for a long time, this Benelli Andretti version m50 scooter only has 500 miles on it when it quit running. lets see what we find while trying to fix it.

[@80sDweeb]

Fixing a broken motor is one thing, fixing what the last guy did, that takes real skill.

[@DN-me8mt]

Umm, nahh, gas , spark check piston , then you have all sorted out , and check the carb . Most 15 year olds in europe knows this and can fix it without any problems.

[@dagrote1]

Yep, nothing is worse than when a guy bring in his machine and a box of parts he'd removed after watching a couple of KZbin videos. Unlless you happen to know that year, model and make really well, you're in for a heck of an afternoon if he's lost a spring, bracket, or gasket or two along the way.

[@rottendrestantje]

@@DN-me8mt I'd rather think any 15 y.o. would swap two color wires thinking he knows it all and it takes a smart mechanic to figure it out.

[@roboticunclephil]

@@DN-me8mt im 15 & i dont know my pud from my ace

[@Maldalf]

@@DN-me8mt that still doesnt fix the issue of "what the previous guy did" Which is a huge problem EVERY single time

[@DancerOfClouds]

The grin on your face Mustie when it fired up and ran properly for the first time was priceless. Like a kid in a candy store. Never grows old. You keep it real.

[@neilmorten6416]

His laugh at the success gets me laughing, too!

[@Ioughtaknowbetter]

I came here to say this. Nothing as much fun as watching Mustie win!

[@vincentpinckard2243]

He had the biggest smile on his face!

[@williamgraham8809]

When Mustie laughs, we all smile!

[@donparker8246]

@@williamgraham8809 I love it that he laughs when he probably wants to swear.😁

[@jansmit4628]

Looked like a rerun from a year or so ago. The switched wires and getting stuck in the woods was very familiar to a previous episode. Contents however is always good and never gets old.

[@andrewhorsburgh2549]

Mustie, you have done it again. Best show on KZbin. Cheers mate.

[@Mr.M1STER]

1:08:44 It's moments like this that we work on cars/bikes/engines. That is one happy man right there. I've said it before but I'll say it again. Your patience and problem solving process when faced with an unusual issue is admirable.

[@jw2par]

Yes sir ! Love it

[@dodgem259]

One very important lesson i learnt from my engineering days when diagnosing problems is that if the job has been worked on by somebody else to always and I mean always double check their work because most often than not you will find the person before you has done something wrong which is why the thing being worked on is still faulty. Many many times I have come to a job where the person before me has installed something wrong and 98% of the time it relates to wiring. Very very good video.

[@handyhippie6548]

man, that takes me back. you're the first person to call channel lock pliers, water pump pliers that i've heard since my grampa died in '05. he always called them that, and he had just about every size of them there was, from tiny ones that might have been 1/2" fully open, to a pair that had handles that were over 2' long, and would grip a 3" pipe with ease. he even had a pair that had "parrot beak" jaws that were specifically for gripping pipes. i still have most of them, my cousin got the rest. you know, benelli sounds italian, but i'll bet the closest this thing ever got to italy was the pizza joint that i'm sure the previous owner rode past, since every town has at least one pizza joint somewhere. the benelli company i'm familiar with makes really good shotguns. scooters, not so much. well, no matter what, the price was right. it's hard to find fault with a deal where the machine was free.

[@marcryvon]

In my area, kids on those *deliver* the pizzas !

[@georgebamber6871]

Same company that makes guns

[@handyhippie6548]

@@marcryvon must be nice. where i live, the only thing that gets delivered is the mail.

[@handyhippie6548]

@@georgebamber6871 imagine that. with the way this runs, they should prolly stick to making guns, those work. this...well, the last guy threw it away. i think that kinda says it all, doesn't it.

[@rogerfrancis65]

Benelli was a reputable Italian motorcycle manufacturer but i think thr name brand was purchased by china, just as AJS ( British bike manufacturer) was so often all that remains is the name not the original quality.

[@jasondandria1979]

Good morning MUSTIE and all the MUSTIE followers !

[@daveh7945]

GOOD MORNING!

[@marcryvon]

Hi Jason ! 😊

[@user-ds6uc2hx3f]

I bet the previous owner added the new magneto with the aftermarket cdi, upon reassembly he got the wires backwards and it never ran right, till you got it and diagnosed it correctly, nice job, I always learn something watching you mechanic!👍🇺🇸

[@HONRTYPE]

Can nothing break this man!?! Love the perseverance, love when the 'fix' is found, love this channel..."all hail Mustie!" 👍

[@jerrybomcool]

I had a scooter a few years ago I got brand new as a Christmas present. Super happy and excited but anyway. Down the line of it being serviced by the dealer he took the sides off and put a screw through the main ignition wire so every time it rained the bike tried cut out 😂 took a bit to find the issue. But stumbled across it when checking luckily I wanted share my story to help others look for things like this. Even from a main dealer as well (from the UK sharing my love to you Mustie)

[@jerrybomcool]

For anyone interested it is a sinnis shuttle 125CC 4 stroke. Good bike but has issues with throttle cable snapping once a year. Another fun story of a day 8am coming back from work after it iced over and my cable got jammed on full throttle and I had use the kill switch to make it 2-3 miles home 😂

[@andyellis307]

I would have enough working out the faults on this thing but filming and explaining to this guy is a legend

[@robertbiggs4934]

I think we were all pretty perplexed trying to figure this one out. It's usually challenging to go where others have been before! Excellent troubleshooting Mustie1! Take care and thanks for posting!

[@michaelosmon]

I was on the phone with tech support once and the guy told me that if someone worked on it before me and it didn't get fixed I should always check his work. When you think about it, it's actually not a bad idea. 🤔 I only just found this channel but I love it. I appreciate you Mustie1. Thank you for sharing your skills knowledge and experience

[@erikmulstad]

Hey, Mustie, you got the Choke operation backwards. When you put power to the choke coil, it extendes-goes outwards 2-4 mm to close the "extra" fuel hole in the carb. When extended it closes the hole that gives extra fuel. Takes about 2-3 minutes to extend all the way. Measure it with a caliper before (when its cold) and after 3-4 minutes.

[@Robvdh87]

It's of the 'melting wax' kind right? Like eg a peugeot 2 stroke

[@YodaWhat]

@@gags730- I was beginning to think this moped was a WHACKED motor! ;)

[@YodaWhat]

@@gags730 Context is all important. No "whacked" without your "wax"!

[@Eddie.D346]

That's interesting;never saw an automatic choke on a 2 weeler.....The older yamaha's had a similar system; not a real choke,but a separate circuit in the bowl just for the choke,and was controlled by a cable,that connected to a small plunger with a rubber tip in the carb.

[@kargo27]

YES! I had a Yamati just like this and I believe the enricher was the issue with mine. The fix I would use when I hadn't run it in a while was to drain the carb bowl, then use the kickstarter to pull/release vacuum to the fuel valve to allow fresh fuel in, and then when it started, lean the scooter down on the left hand side and roll the throttle back and for for a bit. It would sputter for several seconds and then would run fine. If I didn't do that and started riding it right away after starting it, the throttle would bog down and it'd die like it was starving for fuel. But once it was warmed up and running I could stop it and start it up again with no issues. If I let it sit for a week without being run, I'd have to go through the same starting/leaning steps again.

[@marksantos2276]

Just found your channel and LOVE that it is a long video covering the entire fix and diagnosis. This is a SUCCESSFUL fix for sure. It didn't run and could be used now by someone.

[@GavCritchley]

This was a fantastic video. I loved the way you went through it methodically. I never would have got to the crossed wires! Makes me smile because it was only by watching your videos that I became confident enough to work on my sons bikes, and then my mowers and even my cars. I am jealous of the way you so confidently open up carbs and disassemble and reassemble them!

[@general5104]

Yea...I always have spare parts when I get done...

[@YodaWhat]

Get that carb slide in backwards on an _otherwise good_ machine, and you can be headed for a crash at full throttle. Actually *beyond full throttle!* :/

[@AdmissionGaming]

@@general5104 if it went back together without them, it wasn't required.

[@dustinh4175]

No guts no glory.

[@dustinh4175]

@@YodaWhat thats how i blew up my mx175. So sad. My fuel valve wouldn't close and the kill switch wasn't working. I was young and didn't know what to do.

[@williamwampler7742]

This is such a coincidence for me! I just bought a Chinese made scooter for $70 and went through this process! The first thing I did was empty half a gallon of water out of the gas tank… lol. I’m fighting the oil injection and a charging issue right now. There’s a vacuum gas shutoff that I had to replace also. Love watching you bring things back to life.

[@amandahanson8188]

The scooter repair man I go to said he routinely deletes/bypasses the oil injectors and just run with premix so as to eliminate the chance of fatal injector failure. As a rule by the time you realize that the injector has failed its too late.

[@SG-uh6sw]

The good thing is you got what you paid for

[@burtmcgurt3584]

I don't know much about those oil injection systems, but I have heard if you do a delete, you can cause them to run too lean. Good luck with the project. sounds like a fun one :)

[@robertm2663]

I have a couple of these 50cc Chinese scooters, but they're 4 stroke.

[@georgemorales4264]

9:45 everyone and their dog knows what a 2 stroke is but the fact that you explained it anyways; subcribed

[@rickestabrook4987]

I was sure it was the auto-choke. Go figure - somebody switched the wires. Great job, great video. You are THE G.O.A.T. of engines.

[@firesurfer]

When it's no start, it's always some stupid screw-up by the previous owner... or the engine blew up by being abused. I literally just came from work and the supervisors were working on a no signal from the motor. I was thinking, I guarantee it's a bad wire. Two hours later we opened up the plate to find the motherboard had a cable mashed up by their shop. Two bad pins on a flex cable.

[@ProctoLogic]

@@firesurfer They will start fine without choke.

[@firesurfer]

@@ProctoLogic so ?

[@lordracula2461]

@@ProctoLogic Wrong

[@ProctoLogic]

@@lordracula2461 Choke is always on until it gets power.

[@TR4zest]

The only true bit of the story about this scooter was that it had only done 500 miles ... Mustie - your combination of small-engine genius and absolute stick-at-it-ness is totally inspiring. These episodes you put together are like visiting with a mate in his workshop for a while for a mix of coffee and carbon monoxide. Intoxicating ... and have been since the beginning in your home garage. Thank you from the UK.

[@mickeyfilmer5551]

I love watching your videos, how you explain things and actually show your wins and fails. I have learned so much from you, even though my Biking days and fixing cars are well over, Just watching you fixing up stuff is very theraputic. + you get some great freebies- so you win, and we your audince win!

[@itsnotjunkyet1290]

Once again Mustie1 you prove yourself “da man” that no quit attitude is the key, I seriously appreciate the tips and share of knowledge you show and provide. I have applied it in several of my own projects and it has helped a ton! Thank you Mustie1!! More please love it all.

[@V8SKULLS]

Damn the wonderful look on your face when you fixed the reverse wires, was so awesome, I felt like I was right there with you, so freaking glad for ya, thank you for sharing this with us all.

[@mxss115]

These scooters are the easiest things to get running. I bought one for $200 with no spark, pretty new it was a 2020 150cc with under 200 miles, bought a coil and CDI for less than $20 and it fired up and ran great!

[@ianallen2]

The thin pipe on the exhaust is one of the restrictor's. To derestrict it, you cut the pipe off and weld the exhaust up.The Naraku CDI will be a replacement and a derestricted CDI

[@iancameron198]

Hey bro

[@ianallen2]

@@iancameron198 Hi.

[@MichaelBuck]

Genious! Absolute spot on! Congratulations bud, you nailed it!

[@heliodorovela9315]

GOOD IT SOUNDS GREAT ONE MORE WIN TO BRAG ABOUT

[@jasonkirkham7243]

You can heat the exhaust while it's off and pull the restrictor out as I done it 5 years ago to mine

[@jmabs5096]

1:08:30 you can't help but laugh and smile when mustie finally gets the throttle issue fixed and it revs up along side him. Man this was a roller coaster video one of your better ones in awhile!

[@davidt1621]

That's actually an Italian scooter company. They opened a subsidiary here in Texas in 2021 to supply parts for the North American market (they mostly supply the China market), but its corporate status in Texas changed in early March of that year for 3 months during the pandemic craze from 'Active' to 'Existence'. They probably ran out of parts, like a lot of auto parts suppliers did at that time. The subsidiary was run by one of their Chinese agents who probably sourced many parts from the Asian market. This scooter was probably a 'pandemic special'. We're seeing a lot of those these days. It's a good time to have mechanic skills.

[@ianallen2]

The bolt on the exhaust is a sheetr-off bolt. Usually used on ignition barrels on cars so when tightened up, the head snapt off and the barrel cannot be removed by thieves, unless they come prepared with a hammer and chisel.

[@jan_vyhnak]

which they did in my case. how do i know? they didn't bring their own car battery..

[@rogerwale4827]

hi Ian PK . same bolts in UK.also

[@ianallen2]

@@rogerwale4827 I am in UK, Thats how I know what they are. :).

[@meme2287]

I had a problem with an overflowing carb of similar design on a motorbike. After checking the float, making numerous adjustments to float height, and checking float valve and seat repeatedly, I finally found the issue. It was a crack in the brass overflow pipe. I discovered this by clamping the float bowl in a vise (using some wood to provide cushioning), filling the bowl with petrol, putting my finger over the end of the brass pipe, and blowing through the overflow tube - I could see bubbles coming out of the brass pipe about half-way up. I solved it by using Araldite to glue a slightly larger ID brass pipe over the original, which I didn't want to risk trying to remove. No leaks since, and I make sure to drain the bowl after use and turn the petrol off at the fuel tap.

[@macswinford3315]

Small motor gas line slipped over the brass overflow pipe also works to seal the crack. Crack comes from water in the bowl freezing and splitting the brass pipe.

[@CrazyLegsBigOlHead]

Awesome Video. I learned more about 2 strokes in 90 minutes than I have in 40 years of living. Thank you.

[@audioextremez]

This was a good one! Challenging, but you can't stump Mustie1! LETS GO! You had me clapping the moment those RPMs came up and that back tire started spinning 😄 had a huge smile on my face. The sense of accomplishment is such a great feeling. As an Automotive Technician I can relate to that feeling of figuring out a problem that at first has you stumped. Love it! Keep the "will it run" videos coming sir!

[@alan6832]

It looked to me like the float level was too high, and lowering the float level should have a similar effect as lowering the float needle, which helped, but not enough. The excess oil also seemed awfully persistent to be just in the crankcase, which makes me think the oil pump may be out of adjustment or defectively pumping too much oil.

[@htownblue11]

Mustie is the pure joy of being able to pursue a passion. Not always full of nothing but fun, but the end result is always worth it. His reaction when he solves an issue is gold.

[@550stanley]

Oh man, I had Benelli scooter about 8-10 years ago. They are actually pretty decent scooters, at least mine was back then. Absolutely loved it as a quick commuter to the shops in Brooklyn.

[@niek1954]

Hi Mustie1, that exhaust is a expansion model, designed to increase counterpressure to the exhaust port. It's what the cool kids want, to make their scooters faster and flashier. Benelli is an Italian motorbike-builder. They used to produce, next tot mopeds, beautiful six-in-line motorbikes.

[@corydorastube]

I longed for a six cylynder Benelli 750 back in the day.

[@jmsbrn]

You inspire me to dig further in my mechanical explorations. you are a great mechanic and the main reason is that you are curious and persistent...

[@neilbarnett3046]

When it fired, i could smell the 2-stroke oil! A memory of 50-odd years ago.

[@kltpep]

I'm hoping to find something like this on the side of the road that just needs a little air on a tire. Man can dream can't he.....😊

[@Toby_the_Glen]

You'll have to move somewhere rich people live? I love watching these videos, but the real magic is what people are actually throwing away. Anywhere else it would be on Ebay?

[@djaydeved]

im hopin to find a old mechanical type writer man can dream ye?

[@STho205]

I live 65 miles north of Alpharetta/Dunwoody. Those yuppies throw out so many impulse toys or sell them for 1/4 price with almost no use. You buy used up here in Hooterville, the stuff is used to death. Everything used is like buying from Mr Haney.

[@NenadKralj]

where I live you can't get anything for free (even a broken things have price same as working one) 🙄

[@Gutntagged]

i found my 3rd wife like that

[@echobeefpv8530]

Once you get this 100% sorted, I'm sure it will sell quick. Very low miles. Thanks for the great video, you start my Sundays right !!

[@notajp]

You can still see what’s left of the nubs on the rear tire!

[@markjobypaintin5222]

Take it easy mate and we will all look forward to when you are fit and well again best wishes Mark (Worcester) UK

[@jberg8159]

You’re a very intelligent man and I appreciate the content you make. Keep being you Darren!

[@ronaldtillinghast6600]

You are 1 of the smartest people i know on KZbin when it comes to fixing stuff and or figuring out stuff i think its amazing what you do i myself was a handy man back in the 80s and 90s if i couldn't fix it it wasn't worth fixing i love watching your videos always will great work always ✌🇺🇸

[@genturgidson8948]

Damn dude! That was an amazing effort and success! Great job! Always astounded at your skill and dedication to not being bested by other folks cast offs. Thank you for the great entertainment!

[@paulroberts1863]

Mustie is a legend! I wish I had his talent! Love every video he does - especially the ‘will it run’ ones…. Well done for fixing this. Don’t think I could’ve fixed it - keep the videos coming 👍👍👍

[@chrisbraid2907]

I have his talent but still love watching him tackle his challenges, it reminds me so much of me … but hey anyone can learn this, just find some junk/treasures to restore … practice can make you as good as Mustie …. Also pay attention to the details in his videos and you will do well …

[@michaelhartzell9758]

Nice edited video. I enjoy the longer videos where you show every step but this one you definitely edited but still has the longer run time. Nice and cleanly done. I thought it was the choke the whole time, with the loss of throttle control.

[@andrewyearwood5087]

This guy is a genius. I didn’t understand a lot of what he was doing but the video was so interesting I had to watch to the end just to see if would solve the problem. He has a lot of patience, i would’ve taken a sledgehammer to that thing.

[@general5104]

Congratulations Mustie1...your knowledge kicked in and fixed the unfixable! I honestly believe you could fix a bad day!!! THANKS for all you do! I like it that you put the camera EXACTLY where we can see exactly what we need to see, plus, you treat the camera like a person...you ask our opinion, sometimes, and I catch myself verbally answering you. It's THAT personable! You explain everything and how stuff works, and theory stuff, and...well, nobody else has anything like you do or as good of content as you do. You don't adlib, nor have nauseous music playing in the background. You speed up the feed thru repetitive time consuming procedures. It's still there, where we can still SEE how you did...whatever, it just shortens the time it would take for a fullness of video. Your editing is superb and all of it is VERY MUCH APPRECIATED !!!

[@sendit1158]

He fixes my bad day every time i watch him it cheers me up

[@jfv65]

Sounds like the CVT has a limiter- spacer on it to limit ratio change. Lots of markets got these because of local market regulations. There should be info online on how to get rid of this limiter hardware. Maybe you can get a tuning kit for this thing? Malossi? bigger carb. + jetting? exhaust seems OK. These things can easily be made to run 50mph

[@terabbs]

Often disconnecting 1 wire is all you need to do. I know that on my Yamaha mint 25KMH version is limited to 35KMh it is the blue wire of the CDI I only use 1/5 of my gas handle but the 45 versions (limited 50) they use more travel. but they do sound like this on limiting by missing fire moments to limit speed/ engine ref.

[@Montimoped]

Unfortunately it's only a CDI replacement. From the factory, they are rpm limited

[@robfl07]

That’s probably what started this whole “project” with the previous owner… trying to swap in performance parts..

[@terabbs]

@@Montimoped It depends, some can be fooled with 1 wire. not all though. As M]my Mint only needs 1 wire to be disconnected but Might be different in this one.

[@beakittelscherz5419]

This is like a diagnose&search lesson every scooter wrencher can profit from! Step by step eliminating plausible cause. You follow this, you can't go wrong. Excellent Sir 👌👌👌🛠️👍

[@tauncfester3022]

The engine might be running rich because of the exhaust constriction or the Bistarter. If you take that half moon shaped exhaust restriction off the cylinder, that's what makes this a "Moped" rated scooter in many states legally. The bistarter is the plunger you were calling a solenoid, it's not. Hook it up to 12 volts for a few minutes, check for length, should get longer after 5 minutes Should be able to run close to 30~35 mph with that plate exhaust port removed. Also check the engine pulley on the CVT, they sometimes put a metal ring in that prevents the CVT flyweights from running the entire length of their operation "ramps" also restricting the top speed to about 20~25mph.

[@samurboi8007]

Yes it can constrict the flow of exhaust, but the purpose of the "half moon exhaust" is because its called an expansion chamber and is required in 2 stroke engines to help with scavenging to use backpressure to push unburnt fuel back into the engine

[@Montimoped]

Guys, it is CDI rpm limited.... :)

[@tauncfester3022]

Listen I've worked at a Genuine and SYM dealer, and you don't leave the little port restriction in if you want the full affect of the expansion chamber's pressure waves to work. I've owned enough 2 stroke bikes to know this.

[@samurboi8007]

@@tauncfester3022 My bad dude, I misunderstood what you wrote. Yea that makes complete sense if you remove the port restriction, its only there by law anyways to reduce the power output

[@atariforever2002]

Only thing that sucks about Mustie's videos is that they are over too quickly.

[@eric_seguin]

Do what I do. Go back and watch older videos. When you've watched them all start over. lol

[@jeremiahsummers8054]

Over to quickly and with the exception of one video.. are all on KZbin, there has to be a easy way to upload to both Rumble and KZbin.. I guess that's a good problem to have though.

[@itsmephil2255]

I binged watched a shed load of his videos a while back ...best 7 hours iv had in ages

[@Nooneishere33_]

@@eric_seguin Same,videos are so satisfying haha 😃

[@MrBlaser51]

Hey Mustie, You sure put this through the ringer & left nothing left to the imagination ! Bravo for your not giving up !

[@jeffryblackmon4846]

Question everything about what previous 'mechanics' have done when you step into a partially disassembled machine. Good work, good info, good entertainment.

[@colstace2560]

Seeing as it was really low miles, my guess was straight up electrical problem, switched wires is a tough one to find, nice work 🙂👍

[@myharris]

25:01 "Let's poke it with a stick..." Finally, an engineering concept I can relate too 😂

[@Doc_89]

Good on you for getting it running again, its quite a feeling! However, when you finally figured out the reason, I cant help to get unreasonably angry, when "pre-owners" mess about with electronics, and screwing up because of their incompetence. Yeah....been there, done that.

[@MrBlaser51]

Don't get angry. Everyone screws up sometimes? Life is too short, enjoy while we can.

[@MrBlaser51]

PS- Your right it pisses me off too !!! LOL!

[@grantperkins368]

"unreasonably" ... Have you never made a mistake? At least they tried! And they nearly had it: a simple check of THEIR OWN wiring would have fixed it.

[@Doc_89]

@@grantperkins368 Yeah, and they never did, go figure...

[@emilj.4766]

so basically the most common problems with scooters or simple motors in general are carburetors being messed up, maybe some gaskets(low compression problems) and electrical problems. If that is the case i learned a lot from this video. Thank you bro! 1.5h spent with quality first hand content.

[@brentfarvors192]

No; The biggest problem with scooters/bikes is that at least 2 other people have messed with it before you get it...The original problem was the air cleaner not seating on the carb properly, and the people before messed with everything BUT what was originally wrong; Not putting it back together properly...

[@sandys9791]

That engine is a horizontal minarelli. Found in tons of scooters. It was the motor in most 2 stroke yamaha scooters as well. Pretty much the same motor as a bws50 yamaha.

[@rallyscoot]

Its a clone Minarelli Horizontal air cooled.. In the 90er they used the original one. Some parts of the original minarelli will also fit on this clone engine.. The cilinder looks to be the same. (only the clone using P12 piston barrel.. And the old using P10.

[@GManWrites]

Yup.I have a 2 stroke Yamaha BWS been sitting in my garage for about 10 years, it has that engine. It was running when I parked it, I'll get around to starting it up and selling it sometime.

[@hunterm.172]

Awesome diagnosis video! Sidenote-your voice is awesome for radio or podcasting

[@rodneybrand8521]

I never had a doubt you'd get it running..a little fine tuning and it's ready to go..i like the longer videos..stay safe..Cheers 🍺🍺🍺🇺🇸🇺🇸🇺🇸

[@srmoll]

Often on 50cc scooters the 'variator' (the front pulley) has a spacer washer to prevent the front pulley halves coming too close together, and this limits the top speed of the bike. The 50cc bike I had went from a top speed of 30mph to 50mph just by removing this. Mine already had the exhaust restrictor removed as these aren't required in the UK. This might be worth 10mph as well.

[@josemorenoporras7506]

I was thinking the same,plz remove the speed limiter! I hate that cos it revs the engine to the max and the bike is not moving. Totally agree that bike should reach 50mph no problem. And yes,many of those exhaust had a sound trap you could remove too and the engine will be happier. With some simple mods you could have a very fun bike to ride.

[@superloopy24v]

Yes, very likely as you can clearly see the outer perimeter of the variator pulley halves have never had the belt reach the top because there's still a shiny new finish where the lower portion has been dulled by belt contact. Pull that spacer from between the two halves to get full transmission range and a higher top speed. There may still be a restrictor inside the exhaust too.

[@bladerunner6282]

thank you sooo much for mentioning the parlor game "Telephone". i use it all the time when trying to explain to people that once a story is passed from one individual to another, much is lost and the loss continues with the number of indiviuals at an exponential rate!!! but much to my dismay no one seems to remember the game anymore. :(

[@gatdelporco]

Italian 50cc scooters have "restrictors", typically a restriction in the exhaust (if i remember correctly also that small pipe coming off the exhaust should be removed and the hole plugged) and a ring to limit the travel in the variable pulley attached to the crankshaft

[@craigsowers8456]

Back in the day, that was true but the newer bikes from over here use "electronics" to govern RPM ... that little "Red Box" the previous owner installed (and fried by reverse wiring) is where it is accomplished now.

[@whoknows8225]

yeah this is no china clone, this is quality stuff

[@rallyscoot]

@@whoknows8225 Its a clone from the real minarelli engine.

[@T3chpat]

Yes, you're absolutely right, you can easily hear the exhaust is still restricted, that kind of exhaust is much louder when you remove it.

[@astonmartin8706]

Totally engrossed watching you solve the problem- and I’ve been watching you for years - the way you explain in detail and your humorous chuckling is just so watchable and makes it all the more the great entertainment that you are for anything mechanical.

[@WinstonSmith2024]

I would try decoking the exhaust with a caustic soda solution. My old MZ 2-stroke used to refuse to rev when the silencer needed a decoke, easy to do and doesn't cost much.

[@RimjobHimself]

Tell me more about how to. Last time i used 2 propane torches and smoked it red but using a solution sound easier

[@WinstonSmith2024]

@@RimjobHimself Remove exhaust from bike. Block one end of the exhaust with a potato. Make up a strong solution of caustic soda and pour into the exhaust until full. Leave overnight, then remove potato and drain. You may need to repeat a couple of times. Keep the caustic away from aluminium as it attacks it.

[@RimjobHimself]

@@WinstonSmith2024 awesome. Thankyou!! Use a potato was a great idea!!

[@crafty24]

Love your determination and detective work. Great job!👍🏻

[@williamdodd5113]

You are so relaxed and never give up that scooter would have been flung into next week if I was trying to get it going well bloody done my man.

[@chrishartley1210]

With the amount of smoke coming from the exhaust I wonder if they put premix fuel in the tank with the result that it's getting double (or more) oil.

[@marcryvon]

That's what I thought.

[@Kingsoupturbo]

It'll foul that plug pretty fast with injection+premix, (learned lesson on my polaris when paranoid of ancient injection pump)

[@chrishartley1210]

It's probably what started the problems and new parts, wrong fitting etc followed from there.

[@tinkeringstuffs6542]

This one got me screaming at the screen a bit more then usual xD ... in Germany you are only allowed cars at 18 or at 16 with a person who's already got their license for a few years, on board... But scooters are allowed at 14 with a 25 kph (so like 18 mph) limit you also need a license for that... Anyway the older scooters just had a metal spacer in the CVT that kept it from pushing together and going higher gear ratios but the newer ones seem to do it with the ignition and that cutting out at the end of the video really sounded like I remember that sounding xD Which is kind of unbelievable if you think about it. little Timmy going full throttle and his ignition simply cuts out and half of the fuel Timmy puts in his engine simply gets discarded though the exhaust great...

[@J.F.K.O]

It is the same in Denmark, when i har scooter they had the spacer in the vario, a ring in the exhaust blocking 70% of the flow, and a blind pipe. All that to make ik rev like crazy at top speed at 25-30 km/h ruining the engine way faster than if they didn't restrict it and ruining the economy.

[@STho205]

Scooter and motorcycle laws are not national in the US but state to state...thinking of the states the way the UK thinks of England, Scotland, Wales, North Ireland (with their own Parliaments for local affairs). I got a motorcycle up to 5HP restricted license at 14. Had to pass a written and practical. Could ride a moped or a bike up to a Honda CL70cc, the Trail 90 or the Cub50, but police typically allowed anything to a CB125 which was 9hp. Helmet required since the early 1970s. After 16 there was no restriction once passing the drivers test. That was Alabama. All motorbikes must be licensed, tagged and insured. Helmet required. However in Georgia a person 16+ can ride a 50cc bike with helmet, but no license, tag or insurance. They are considered motorized bicycles. Florida and South Carolina no helmet required over 18, minor riders must wear helmet. It depends on the state. Some surprise you. California is highly regulated on many things, but no helmet required and lane filtering is allowed....prohibited in the vast majority of states.

[@J.F.K.O]

@@STho205 okay

[@dublindave5795]

@@STho205 Helmets are required in California, and its called lane sharing or splitting and they passed a law (2016) that addressed this. CHP has guide lines before they will issue tickets for reckless driving. I've been riding since 1970 and was splitting lanes just last Friday..

[@twt000]

@@dublindave5795 Splitting lanes is frowned upon to serious/normal riders. It makes one look like a Jackazz you know.

[@stevenjohnson7571]

This is the best explanation I've ever heard. Great video! I'm about to do my carbs on an 85 interceptor 700. It doesn't look fun. But I'm confident.

[@chrisgreen1094]

Benelli are an Italian bike manufacturer in their own right so it’s not a Chinese clone. They made some really nice super bikes in the 90’s. Most probably better than a Honda Scooter as the Italians love a scooter. 👍

[@maxinlux6570]

He's not entirely wrong, unfortunately... Gone the way of Grundig, MG and so many more... From Wikipedia: "Since 2005 Benelli is owned by the Qianjiang Motorcycle, a Chinese company owned by the Geely Holding Group." Sic transit gloria mundi...

[@darinblomquist422]

Benelli has been made in China since 2005

[@DoRC]

As others have said above Benelli is a zombie brand. It's a Chinese scooter.

[@curmudgeon1933]

Benelli are now owned by Chinese holding company Geely, and are made in China. Geely also own Volvo, Polestar, Lynk & Co, Proton, Lotus, etc, etc, and made over 2.2 million cars in 2021.

[@Philc231]

Problem is China owns Italy and no doubt has taken their manufacturing to slave labor in china .

[@nanny0249]

Clever Kid!! What a thrill to have you find the problem.

[@juanfelt]

How come in the US people throw away (or give away) stuff like this!! I understand that it takes the amazing and unique skills Mustie has (I've learnt so much from this amazing channel...), but here in Argentina they will sell them in such condition. Anyways! Thanks for the amazing and entertaining content, so refreshing in this sea of pointless videos...

[@simoncullum5019]

Same here in the UK

[@notabagel]

People sell stuff like this in the usa too--mustie just is the guy who knows a guy for every situation

[@tayro7265]

I bought a 150 for my daughter with 14 miles. The dealer couldn't get it to run so they sold it for $600.00. The only adjustment was the idle. So I got a slightly larger carb with interchangeable orifice seats. With the larger carb and a 4x larger jet orifice, it can run 60+mph with me and my wife on it. Surprised me, I'm 6'3"/250lbs and she's 130lbs and it pulls off from a stop very well.

[@WolfmanDude]

The wired "emisssions pipe" is "secondary air" for the catalyser. Yes, a catalyser :D The emissions regulation is what killed those things here in europe. They became too complex and unreliable. Your scooter has a "minarelli" motor. Thats what the general construction is called, all the parts are compatible.

[@Tomthumb222]

I was convinced from the start of this video that the ignition timing was at fault. I suppose I was wrong, but it was an ignition fault at least. Great work and well done.

[@smith951]

Exhaust fumes killed my grand dad

[@tsmith235]

I just love your laughing when you finally make it run I'm sitting here laughing along with it. I've been watching you for a long time some of your videos are on so long and yet you always learn something new thanks a bunch there musty

[@kman0146]

Good catch on the wiring. Did you ever check to see if it actually had 2 stroke oil in the tank ? I've seen everything from motor oil to gear oil put in 2 stroke tanks.

[@peterfitzpatrick7032]

The smell would probably give a bit of a clue... I've done it myself in a pinch when I was a young lad & didn't know any better... 🙄😂

[@billwhite5188]

I firstfound you doing the red Karman Gia, and followed most of your projects since. Yourknowledge is amazing, be it new or old junkers. Great job every time sir.

[@caveone-365]

I fix and mod chainsaws for myself and customers often and this is a testament to how a restrictive exhaust can really mess things up. You should port match that exhaust port on the cylinder. That thing is super restrictive as-is. Bet you can advance the timing a little too and wake it up even more. If it's anything like a saw, the muffler and exhaust makes a massive difference when it's uncorked and that port is AWFULLY TINY on there so I know it would make a huge difference to open it. Couple passes with a die grinder and a rasp or a Dremel is all you need. Shame how much emissions garbage they're putting on 2 strokes these days. That hose is probably some type of bypass for like an EGR or some nonsense that isn't needed and just further complicates things unnecessarily. I'd delete all that garbage. Business card is a quick and dirty way to space for your air gap on the pickup too Rock on Mustie 👍🙂

[@litltoosee]

Hey mustie, long time admirer here... I think the science community could use your skills with their problems with FUSION. You could probably have a FUSION REACTOR firing in a video or two! Awesome display of diagnostics! Thanks so much and this was fun.."kick my ass"....No way!

[@TheSitscha]

Hi Mustie, I think the CDI which is now plugged in has a limiter included. In some Countries ( like Germany), you can Drive a Scooter when you 15 year old, but the Speed of the Scooter had to be limited to 15 miles/hour. When youre 16 years old, you can acquire a license which allows you to drive 30miles/hour. I think the CDI now limits the rpm's.

[@laoluu]

That could very well be. On the other hand, I also think that the clutch is slipping a little much.

[@ripstitchupholstery]

Great video as always. a little FYI...the black cdi boxes come with around 5000 rpm rev limiter built in,,,that's why people change them out. Try the red cdi box.

[@ronrico2620]

I worked on scoots for about a decade. It was fun watching someone make overqualfied noob mistakes like i did. You should be going closer to 45 on that. They like to put restrictions in different places. Either a main jet that is too small. A washer that restricts the exhaust or a washer in the variator. We used to work those 50cc 2 strokes up like you wouldnt believe. One time i took off on a test ride on the most tuned one we ever did i almost lost it on take off. Im glad i was about 250lbs at the time to keep the wheel down

[@LazlotheInstigator]

Salty Army 4:30 Avocado time?

[@a1andy374]

Reeeeeeee

[@asideofbeans5803]

sounds about right ReeeeEEeeEee we are legion!

[@arclightredux6088]

🧂🧂🧂🧂🧂

[@surv1vorfan]

I love these videos it's like therapy for me...I can watch them all day long.

[@tomdunigan234]

I sought your videos out by a recommendation from the bug club. Thank you for doing these. Your knowledge is impressive and an ability to share what you know and how you work through a problem. I saw you at the dust off Sunday but didn't get the chance to say hi. Great seeing your single cab.

[@MrChiiTar]

Just as an aside... when you had the transmission cover off that CVT and showing how it worked, I noticed only one side (crank side) of the CVT was adjusting. You can tell as the belt axle side didn't contract its diameter as you throttled up. That would half the top speed of the lil' scoot, giving the impression that the engine isn't revving to full, when it's actually the weights on that CVT, axle side, that are stuck in position.

[@johna.s.3847]

I agree. cvt issues

[@billhartsfield424]

Kudos on persevering to find the issue.

[@Skyfx89]

That's a Benelli X49 Quattronove (Air Cooled). I had one back in 2008-2010. I had the following tuning on it: MK Handmade 70ccm Sport Cylinder, MK Handmade Alu Exhaust, Dell'orto 21mm Carburetor, Hebo Intake, Stage6 NBR Reed, Hebo Flex Belt, Hebo Next Generation Variator (Rollers 4.4g). Ran 95km/h flats, 85km/h up the steepest hill in town (STEEP!). If I were to make any changes, I would have gone with stiffer clutch springs or a sport clutch altogether. It was very low geared in retrospect, but acceleration and pull were insane. This was the first model by Benelli after they sold out to the Chinese, so there were lots of tamper proof round screws and unknown Chinese stock parts, like a 12mm unknown carburetor with unique shape jet screws and carb starter. Had to use a manual button choke. I also owned a Benelli 491 before this one, which was 100% made in Italy, water-cooled. Ran 80 km/h just unrestricted. Engine so powerful there were 4 restrictors in it. It's sad two strokes has been decimated by emission regulations, it was a dream for a youth to drive, both of them. I still have the pictures of them both, the 491 I colored custom myself with 0 experience, turned out perfect. So rewarding for a 16 year old.

[@johnnorman6022]

the lesson here is don't ever give up don't be a quieter keep trying for success.

[@hectorcorral2419]

ill make sure to eat my avocado at 4;30

[@arclightredux6088]

🧂🧂🧂🧂🧂🧂

[@jeffmonk2247]

I spent 1000 for a seazed bike. So much for trusting ones word. Great video

[@chrisg6091]

In the end the cause was what we call in our workshop 'fingers'. Somebody fiddling aimlessly until they rendered it completely inoperative. Interesting vid 👍🏻

[@YourJapans]

The troubleshooting is awesome. that's invaluable experience.

[@csachevauxsansabri2612]

Oh no, it goes to show, when someone has there finger's in it. You did it great job. So happy

[@tkitt1048]

Another fine job Mustie!! Enjoyed as always

[@abzbrk490]

i think you kicked it back. you are a mechanic who don't take no for an answer. i enjoyed you work thanks

[@jonzich]

This was absolutely fascinating. I've watched a number of your videos before and wondered while watching this if you were going to give up. But I've seen enough of your videos to know that you're not a give-up type of guy! So I've wondered... if the original owner watched this video and at some point said to himself, I wonder if maybe I got those wires crossed?? Geez, nobody would have started there... can' you image the trouble you would have saved yourself, not to mention the HOURS!! You've got a great subscriber base, so this sort of long-form video probably is good for you--it certainly had me watching the whole thing!!! Congrats on the fix!

[@trickster11300]

Greetings from the south of France. Enjoyed the video as always. Congratulations to the recipients of the stems. Regards, Mike