Why did I Blow Up my Big Bore Maddog Ruckus that Boca Scooters Built?

[@JohnSmith-ps7wp]

This is how I learned to work on internal combustion engines. A hack screwed me about 15 years ago and I spent the next 18 months after that teaching myself not to rely on a hacks. Almost nobody will ever care about your stuff like you care about it. The sooner you learn that the better off you will be in life. I own a 150cc Ice Bear trike. I had the cam reground and bought new springs. Milled about .010 thousands of an inch off the head, changed the sprockets, installed a custom exhaust and increased my ground clearance 3 inches. It hits about 75-80 mph on flat highway and I couldn't be happier.

[@GhettoWrench]

Those are the truest words ever.

[@calebbierig3573]

Honestly man, I dropped off my moped at synergy motorworks in Oklahoma and they completely busted my engine mount off.

[@calebbierig3573]

It makes me so mad. My head hurts tbh just thinking about it but I got it fixed so oh well ig

[@iserved8840]

Just because of the blatant disrespect from Boca scooters I would file a lawsuit and make it known how their customer service is non existent. Hats off to you for the great content.

[@BoozySZN]

I bought my yamaha aerox 50cc 2stroke as none runner and spent over 8K on it. I only take my scooter in for MOT and I always tell them, if anything needs replacing, CONTACT me first as I know what parts I want and NEED. I would never get a general scooter mechanics shop to work on a highly tuned scooter, 9/10 times they have no idea what they're doing. I am 30 years old now and been maintaining and rebuilding my own scooter for 6 years or so, super happy that I took the time learn how to do basic maintenance to full blown bearings, crank seals, top/bottom end building. electrical I am pretty decent, but not fully there...I get my friend to do most of that if I need it.

[@GhettoWrench]

Agree. And with youtube it is pretty easy to do almost anything and a good excuse to buy tools! The mechanic at Boca Scooters is a complete amateur and did not know basic things.

[@potta061]

Never spent 8k on it

[@thereal-stl_slim]

My 50cc was doing 45mph all day with simple upgrades, 5000 miles no issues

[@Benjamin-xv2hg]

Thanks for all the information I didn't know the piston went a certain way.

[@grazz7865]

“IN” always has to be up

[@Justin-bj8jq]

I commend you sir for the amount of professionalism you’ve shown. What an incredible lesson. I feel sorry scooter shop, they really lost an invaluable opportunity to grow… Hat off to you and you’ve earned my subscription. Keep the great content and good vibes coming!

[@GhettoWrench]

Thank you so much

[@MiguelLopez-sj2ib]

damn dude hop off his dxxck

[@jasonsmith3726]

Wow that is mind blowing. I have a 49cc Honda ruckus with an intake, exhaust, ncy cdi, ncy coil, polini variator, dr pulley 5.5 gram sliders, ncy drive face, ncy oil decompression tube, bigger jets in stock carb, and a bunch of aesthetic mods. No big bore kit still 49 cc stock internals but mine tops out at 56 downhill and can hit 50 consistently on the flat. They had to have really messed your bike up and ran things backwards for that 90cc to only hit 38mph I would think that should go around 60 with that setup. I don’t know anything about the ice bear engines though. Your bike is very clean looking and sounds good. I hope you get everything situated and can enjoy that bike for years to come

[@mikeylopez9625]

i can tell you right now , youre fully of shit . i been doing this , i got 50cc, 150,182cc, ive built big bore and water cooled 4 valve split case for cam chain swap i can tell you fro a 35mm piston you are not hitting 50...i promis max your bokking is 40, 41

[@LikquidDutch]

I don't know how I stubbled here but very interesting video sir thanks for sharing.

[@GhettoWrench]

You were sucked down the youtube rabbit hole!😆

[@LikquidDutch]

@@GhettoWrench Indeed I was 😝

[@jeffmee763]

Just make sure you bed in it can take about 300 miles to do on the 52mm set up done two with hot pistons. nice looking scooter

[@GhettoWrench]

Thanks

[@violetstill11]

When upgrading the cylinder and piston to a bigger bore than 47mm, it is HIGHLY RECOMMENDED that you replace the crankshaft with a much stronger one like a Naraku HD crank. The GY6 139qmb overseas run the 72cc cylinder from factory no problem it’s when they come to the US they need to have a minimum displacement of 49cc. When i got the 47mm BBK and upgraded the transmission with full performance parts with a quality carb i ran the scooter HARD for 6 months straight as a daily. Anything above 47mm or 72cc is a ticking time bomb. Other than that, these engines are extremely reliable if the oil is changed very frequently. Watching further into the video it’s absolutely astonishing that so many thing’s were wrong when they installed the BBK..

[@GhettoWrench]

That makes sense. I will run it till it blows. I enjoy rebuilding and changing stuff. An excuse to do a GY6 150 up.

[@albertkorpi]

i ride 81cc with stock crank and used car oil

[@grazz7865]

You are 100% correct. I was told that the QMB139 engines are actually built on an 80cc platform. I did the 80cc upgrade. Huge difference. I was told 80cc is as high as you want to go. 100cc runs too hot. That’s just what I read from other people. The 80 kit gets me to 40-45 no problem but that’s about where it tops out. Allows me to at least keep up with traffic. The 50cc was able to get to 42-43 but man, what a struggle to get there. Now that I have the 80 on it, I’m enjoying the extra power and I’m also coming to realize that’s actually as fast as you want to go on a moped. 😂😂😂

[@grazz7865]

@@GhettoWrenchthat’s a bigger job. The mounts are different for the 150

[@grazz7865]

@@albertkorpimotor oil is the same for cars and motorcycles. Sure, they make special cans marked “motorcycle oil” but I’m pretty sure it’s the same 10W30 that’s made for cars.

[@steelbones7509]

WOW... that is a sad story :/ Thanks for sharing it though :)

[@iliveinthe80s38]

No they should be pointed at, thank you for letting everybody know

[@Hitech82]

I have the 50cc(BIG bire kit) peace sports. Its a plastic pony. But i used to race progas harkeys for 14years. So i flowed the head. Hoka gears and lightened the clitch. and set up my own variator. I run 72mph and 16.16 in the 1/4mile

[@GhettoWrench]

Damn that's a fast 50

[@ballsackmanfred]

Needs links and info im tryna go fast

[@ORIGINALCONCEPTGARAGE]

Sweet Dude Its Time To Step Up To 232cc 4v LC Swapped Honda Ruckus Like We Do

[@wildlifenowife9886]

I want to do the 232 4v on my gen4 150cc I have now

[@ORIGINALCONCEPTGARAGE]

@wildlife=nowife I'm just now getting these comments back for some weird reason seriously come check us out for real it's getting upgraded right now with rear disk brake Forward Foot Controls and new wiring harness and the works

[@heavystarch100]

So the shop detonated a perfectly fine scooter. W0W!!

[@GhettoWrench]

Yes sir. LOL. Always do your own work. You can buy cool tools with the money you save

[@protechnh]

That’s crazy! Thanks for sharing. Side note- what bag is that?

[@GhettoWrench]

It is one of those bags that strap to a sport bike rear seat. Nelson Rigg is the brand

[@vitiosus701]

I have a newb question: If we change out the exhaust system on the GY6 engine, do we need to tune/change the carburetor?

[@GhettoWrench]

Technically yes for "fine" tuning, but it should still be close enough that it will run fine with the stock carb settings.

[@srerccustoms537]

Wow that shop needs a QC department lol

[@lexxani3336]

Honestly in my early years of building gy6's I learned hard way its cheaper to scrap the 50cc engine for 150cc engine. Out the box will push around 50-55mph, where as you gotta spend $500+ in parts to get a 50cc to do 55mph. Even then might blow engine with that big bore kit cause 50cc engines have weak cranks.

[@GhettoWrench]

Now you tell me. LOL. That is pretty much what I have figured out also. I will make a video on the 150 conversion for sure.

[@Locked_in_with_DaQueen]

And where is the best place to get one for the maddog. I have a gen 5. Thinking this may be my best route.

[@anthonymyers-35]

Excellent video and explanation 👍

[@xxgaming-qx3fk]

Hey where did you get that 2nd seat part and how did you attach thx and sorry to hear about your maddog

[@GhettoWrench]

That is a motorcycle thing for the back seat that straps to the bike. I took the straps off and just bolted it to that metal plate under the seat. I am out of state right now so no idea the brand or model.

[@lexxani3336]

Next time send it to yo boi ill have you pushing 55 in no time i love building engines

[@danhemsworth7488]

Been having a nightmare getting BBK to work on my agility 50. First kit worked great, back forth to work 20 miles Rd trip every day did 50 flat and I weigh 235, 55-60 downhill. A valve spring broke and bought a brand new motor from Rollingwrench, damn thing wouldn't start, got it to start with drill ran like a raped ape, Burned through starters .Now my final try will be putting new head on stock 49cc, stock manifold carb etc.

[@GhettoWrench]

My CV carb has an accelerator pump. Never would have guessed these tiny carbs had that. That pump barely works when I twist the throttle, but I can push that pump rod down with a screwdriver a few times and spray gas into the carb. If I do not do that it will never start and just run the battery down and eventually burn up the starter for sure.

[@GhettoWrench]

I have no what idea what RPM I am running and fear trying to get more RPM with the roller weights as I think the valve springs may fail like yours did as they seem to be the same springs and not "performance" ones.

[@grazz7865]

@@GhettoWrenchyou are correct, these carburetors are tiny and the jets are even smaller. The fuel has to pass through a hole the size of a human hair. Easy to clog-especially the idle jet. I pour a capful of seafoam on every fuel up to keep the carburetor clean. Runs smooth.

[@grazz7865]

@@GhettoWrenchI wouldn’t bother with any mods other than a big bore kit. If you’re running a 50cc, you’re only going to get but so much power. The combustion chamber is smaller than your pinky nail😂😂. Big bore kit is the only real way to get any significant difference out of it.

[@richardhenry1969]

Because of Everything you had to do to get speed. That is why I bought a 2 stroke. I bought one off line 6 years ago for $2000 it would do 50 mph on straight flat I got 60. Then Baltimore city police took it because my license was suspended for a seatbelt ticket. Plus I was the right color or I wouldn’t have been harassed. Everyone sees the kids riding dirt bikes through traffic. 2 stroke is always the way to go.

[@GhettoWrench]

That's amazing. I have heard of that stealing people's bikes. You think they give them to their kids? Ya I know for sure if I was not white I would have been arrested many times by now. SMH.

[@rustypotatos]

You rock man nice

[@ORIGINALCONCEPTGARAGE]

What App Are You Using To Get Your Speed For Real

[@halffolk21]

Google maps tells you your speed.

[@ORIGINALCONCEPTGARAGE]

@Boss Man never thought about that I think I'll try that next time on my 232cc 4v Liquid Cooled Swapped Honda Ruckus that's being all redone right now but great video brother I love watching and interacting with our community

[@ORIGINALCONCEPTGARAGE]

@Boss Man sorry brother it says this comment is from 3 weeks ago and I'm just now getting it for some reason I'm not getting my comments right away like I should be getting

[@ORIGINALCONCEPTGARAGE]

@Boss Man just relized Boss Man This Isn't Your Video LOL But Thanks For The Info As I'm Running A Trail Tech Vaper But I Haven't Gotten It Dialed In Yet

[@GhettoWrench]

play.google.com/store/apps/details?id=com.milejko.dragracer

[@woj09kirk]

Where did you get your exhaust?

[@GhettoWrench]

Ebay. If you search GY6 Exhaust tons of them come up. Chinese Yosh and Akrop knockoffs also come up. I spliced mine onto the original header as they don't really fit without some mods. If you don't have a welder just cut it how you want and mark how it goes together. it would be a cheap and easy job for any muffler shop to finish.

[@fngrcx]

Bro Amazon has gy6 150cc perfect for that bike all the fun you'll ever want

[@dashobie]

Stretched out mini bike

[@cityofjoy2576]

When you have a big bull kit bore, you order me. Should check the oil after every 2 rides. These are known to f*** your engine up. And you have to check the oil constantly

[@alessandropuleo5254]

motori bello 💪💪 😍😍😍😍😍👌👍👍

[@GhettoWrench]

Grazie!

[@alessandropuleo5254]

@@GhettoWrenchio sordo ?. scusa domanda tu moto euro? Sì o no

[@GhettoWrench]

@@alessandropuleo5254 No. I live in Florida, US

[@alessandropuleo5254]

Scusa io 🙇🙇🙇🙇 ok holle ciao olà 😅😅😅☺️☺️

[@chadshardwood247]

crazy the shop acted like that clearly theyre crapy work prolly some newbie worker or something think they would own up to it ... i would ask your friend to tell the bbb

[@seanmayo206]

Have you hea d of vemon motorsports usa?

[@GhettoWrench]

Yes... They have the best pictures of bikes I'm checking out. Their prices seem good.

[@792bnz]

even on a 2 stroke, you still have to put the piston in the right way

[@GhettoWrench]

Matters even more on a 2 stroke cause the 2T piston has ports or big holes in them that air fuel mix goes through on the intake side

[@randombuilds8336]

1 tooth off is HUGE, most bike engines that puts you off almost 10*. Some won't even run 1 tooth off.

[@GhettoWrench]

Ya crazy it actually ran so well. I've slotted my own cam gears after milling heads back in my race bike days and I would barely move them.

[@randombuilds8336]

@@GhettoWrench Yeah, SOHC is more sensitive than DOHC as well. But even then changing just the intake by 5* can make a big difference in where the power is.

[@grazz7865]

Agreed. I bought a brand new moped. Could not get this thing to run right at all. Maximum speed was 10-15 mph. After that it choked, stalled, you name it. I tried everything to get this thing running right. Company sent a new engine under warranty. I swapped the engines. Much better. One day I decided to tear the old engine down to see what was going on. I was thinking bad rings or bad valves. Timing was off by 2 teeth. That was the whole problem. So of course it won’t run. Valves are opening and closing when they’re not supposed to.

[@GhettoWrench]

@grazz7865 wow that's crazy. Chinese slave child must have been having a bad day

[@AndyDarius-yx5cy]

Tire size on rear tire ?

[@GhettoWrench]

140/70-12

[@gullahgeechee2699]

always swap to a gy6 150cc since the frame is registered as 50cc😉😎🤝

[@GhettoWrench]

I struggled with what route to take. GY6 or fix the 50. Decided to fix the 50 to prove that the previous work done was shit. I will eventually put a GY6 in it and weld my own mount up top.

[@gullahgeechee2699]

@@GhettoWrench best bet is to do it yourself once you’ve figured out.

[@grazz7865]

@@gullahgeechee2699agreed. It’s really not that difficult. Just take your time and go step by step.

[@mikespl4180]

Looks like Boca needs to stick to BMX bicycles and not touch any scooters huh...😂😅

[@Enzo-ob3fg]

Where buy the kit please ?

[@GhettoWrench]

NCYSTORE.COM

[@Enzo-ob3fg]

@@GhettoWrench thanks

[@GhettoWrench]

@Enzo-ob3fg Their search engine sucks so you have to Google the part you want and then add ncy store to find it in Google. But they ship super fast even from Cali to Florida.

[@jaymartinez2956]

There is a governor

[@GhettoWrench]

I didn't find a mechanical one. I assume it is somewhere in the CDI box. Not really wanting these Chinese junk motors too high of RPMs. I think stuff will start flying apart. LOL

[@jamesfulerten8494]

Cause the Maddog's are too LA ghetto for Palm Beach County especially riding around in Boca, not good. You have to ride a Maddog stealth when in PBC or it will cause problems. Stealth !? What the hell does that mean !? Hell, I don't know but you have to ride a Maddog stealth in PBC somehow !!!

[@jonathanmcadams-nx5zp]

Get a 150cc and be done with it. Ughhhh I like the older kymco super 9 LC (liquid cooled) 2 stroke 50cc and put a big bore kit on it that goes 60mph off the rip with bbk. It is a 70cc bbk and is cast iron but is strong.

[@GhettoWrench]

Ya I have a couple of 150s also. The 50s are still fun though.

[@unknownmanufacturer2669]

To much heat and stress without enough parts changed over for the upgrades not to mention the up keep on them after

[@GhettoWrench]

Ha... I wish that were the case. The "properly installed" upgrades are working just fine.

[@JulietacasanovaUwu]

Motor 50cc?????????????

[@GhettoWrench]

Yes

[@rustypotatos]

6:00 lmao ok wtf

[@Molino-Red]

No wonder bro it was a 50cc that’s why it’s so slow.. I have a 150cc running 171cc and its fast no complaints here

[@GhettoWrench]

You may have missed the point. And anything south of Liter Sport Bike is "slow". So no, your 150 is not fast.

[@Molino-Red]

@@GhettoWrench lol I under your point completely but mines is way faster I’m sure not saying it’s the fastest thing but it definitely moves good 👍🏼

[@Molino-Red]

@@GhettoWrench It hits 77mph not fast I know but for it being so low to the ground feels fast lol

[@GhettoWrench]

@@Molino-Red Nice. That is moving on these goofy handling scooters!

[@steammartian7705]

Unfortunately going from a 50cc to 90cc isn’t really much of a difference. U won’t notice a huge difference. Jumping from a 50 to 150. U just need the gy6. Clearly they didn’t understand how a motor or piston works 😂

[@GhettoWrench]

Agree. My mini bike went from 19mph out of tractor supply to 57mph with all the mods. But it is a 212. The 50 4 stroke just ain't gonna do that much no matter how many mods. LOL. I will eventually do the gy6 as they are pretty cheap. I will prob just weld the ebay cheapo mount on top and repaint the frame.

[@steammartian7705]

@@GhettoWrench right. Yea. Also. That’s all gearing too. Plus many other parts. Blah blah blah. Plus it’s a 212 meant to make power. But also with a governor. 🤷‍♂️ I have an xl250r. Can it do 70. Sure. But can I hang out there. No. I can only do 55. Still not allowed on the highway 😂 they’re all built different. Besides. I think that they would do away with the go kart clutch and put in some that can make power. They would be like a true 50 or 90

[@grazz7865]

@@GhettoWrench agree. Mods won’t make much of difference. Maybe 2-3mph. Whoa! 😂. Not worth the time, money or effort. You’re only going to get but so much power out of a combustion chamber the size of my pinky nail. A big bore kit will allow you to get to top speed faster. I did the 80cc BBK. I can get to 40-45 within seconds whereas before it was a quite a struggle to get there. The BBK made a difference in power, but not much difference in top end. The bike still only gets to 45mph. Anything from there is a struggle. On top of that, 45mph on a moped is really fast enough. They’re not built for breaking land speed records. They’re built for economy and commuting. Let me wrap this up by saying the 80cc allows me to at least keep up with traffic.

[@rustypotatos]

1:14 NO NOOOOO WTF NO OMG NO

[@GhettoWrench]

Ya I had to google pics of how it goes in. I had no idea it was upside down at first. LOL

[@rustypotatos]

@@GhettoWrench short term easy purchase, long term death sentence

[@GhettoWrench]

@@rustypotatos perfectly said. LOL

[@hammah_3928]

I swapped my 50cc to a 150cc big difference in speed..50cc is just too slow no matter what upgrade you do to a 50cc it will not be enough

[@GhettoWrench]

That's a fact. Just fun cause I can drag race it in my driveway and do top speed runs wothout ever getting a ticket. LOL. Did you see this one now? Doing 53mph. Faster than both my 150s when I got them. The 150s need mods too. All these maddogs are slow.

[@hammah_3928]

@tedowen409 I did very impressive 🙌

[@1969camaro]

They put a rookie to work on your scooter

[@GhettoWrench]

Ya for sure. LOL

[@andrez906]

Because it's bored jus swap the block

[@AlbanBela]

Dont by them people These are trash bikes i swear I have one on my backyard

[@ASLackey22]

Not all of them are. Surprisingly I kinda depends where you buy from. Two of my friends have maddogs. One has had 0 problems so far and the other has had carb issues and a bad tire from the factory. Both had less than 200 miles on them. Of those two owners one also bought the Chinese grom as well. 0 problems so far on both his scooters.

[@shaolin398]

For someone who does this as a hobby...u seem to know allot and have good camera footage and editing tools to label the mistakes..don't know your end game but you're definitely are not the person or have the lack of knowledge you seem to portray but nice try

[@GhettoWrench]

Didn't know I was trying to potray lack of knowledge. I have tons of knowledge in the DIY engine arena as an old gearhead, but these are my 1st small engine toys. I use a gopro 9 , quick and Wondershare to make videos. End game; to keep people that are not gearheads from getting ripped off at Boca Scooters. LOL

[@shaolin398]

@@GhettoWrench Well you're very knowledgeable and keep up the great videos. Very helpful sir. Thank you

[@shaolin398]

@@GhettoWrench Just subscribed to your channel because of your response. Thanks again

[@joneserupinsmoke9161]

bbb if u psy em they give good review 4 u