80cc Motorized Bike Problems and how to FIX them

[@BenCarano]

All the parts I used to build the bike itself are in the description of Part 1 of my 6 part series on building a motorized bike here: kzbin.info/www/bejne/kKrVooZ4nMulbqs

[@af8550]

My bike keeps going as if the throttle is turned even if I take my hand off the throttle I can’t stop

[@BenCarano]

@@af8550 it won't shut off or it won't go from fast to an idle?

[@af8550]

So I release the clutch and pull the throttle it runs quick but when I release the throttle it just revs higher

[@BenCarano]

@@af8550 first thing i would check is if your carburetor is clean. sometimes they get stuck in the open position and don't go closed when you release the throttle

[@af8550]

Thanks hopefully I can fix this just made it today

[@ahmedkazmi7551]

Amazing work, probably one of the clearest and easy to understand videos out there.

[@BenCarano]

Thanks! Glad you liked it!

[@Audiophile1967]

Thanks Benjamin for your clips about the 2 stroke bike engine.Im loving to play arround with those kind of engine as my hobby. From your clips it’ help me understanding step to steps though the whole process. Years ago I don’t have motorise bicycle yet , some time I play arround with lawmover / garden blowing or edge cutting with fit 2 stroke engine with I just start them up and listen to the sound of engine ! My Dad unhappy cause I stuck up his garden’s equivalents 😳😳 I’m now nearly 40 years old I’m driving heavy vehicles for 15 years for living , 5 years drove a truck then I change to long distance coach driver still now but my hobby still there as I’m now love to ride my motorise bike and my 4 wheels go kart 80cc 2storke. Don’t know the law in your Country but in Australia they allowed electric bike on public roads but not motorise bicycle so I had to ride in the back road or bike track ares to ride! One again thanks for your video clips with really interested All the best Jimmy

[@o0peacetogether0o]

You seem like a real hands on kind of dude keep at it man! Great things take time, the biggest step is the first one. You're on your way !

[@tyler6903]

"hands on" is an understatement with those claws

[@codelicious6590]

The uh, "lower performance" carburetor also has a jet under the needle which can be replaced with 5mm thread jets. .65- .75 is generally optimum range. The Delorto knockoff jets or, "higher performance" carb will work for the stock carb also, and I have found this is the one (stock carb) which works better in KS. Many enthusiasts feel the same.

[@JuanGutierrez-zh2fj]

Huy

[@richiej2640351]

Yup

[@JorgeRodriguez-ei2gi]

Excelent, mr carano thanks, keep us update with trouble shouting & upgrades about motorized bikes, thanks say hello joe from panama.

[@jeremiahacree8896]

Cool video man, pretty informative... I wish this video was out when I first started building motorized bikes...subbed

[@halethewhale]

Tip with the magnets, if you have some powerful magnets you can re energise the flywheel with them i recommend some from the motor of an old bench grinder.

[@hughmongous6613]

I'm not gonna lie, would really love to have some of that turbo in a can...😍

[@leonardodahumanoid4344]

So would l, in a tall glass with ice.

[@pbtel]

Brilliant video! Damn you must spend a lot of time on these. I am thankful, you are saving me some time :)

[@marcs4091]

Nice vid! Helps a lot. I have a bad ass 79cc 4-stroke build. But just started my first 2 stroke build. Can be a little overwhelming at first. So much more complicated than a 4 stroke. But hoping to get some good power.

[@BenCarano]

Absolutely, In reality a 2 stroke fires twice as many times as a 4 stroke, so a 2 stroke will give you almost twice the power for the same size engine. However, because two strokes rev at such high RPMs, they tend to be a little less reliable and require a little more attention, so that's why I made this video to help with taking care of them. I'm glad this video helps, and I wish you luck on your build. I'll probably be doing a pretty complicated build soon putting a Honda GX120cc 4 stroke engine on a bike.

[@hughstevens510]

Oh don't worry they're not really that complicated they're actually kind of pathetically easy it's just that everything that's new seems complicated until you get used to it but once you get used to it there is practically nothing to them to stroke engines it took me a little while and yeah I still have issues sometimes but it's not because the thing is still complicated it's just cuz my mind has trouble wrapping around the various functions of what happens with your fuel air mixture so don't worry once you get into it real good you'll find that it stops being complicated real quick

[@hughstevens510]

The thing where you were just talking about the leak behind that wheel there's also a Rubber seal that goes in there a donut thingy and if it's messed up it'll straight let your gas and everything out into the Magneto area

[@johnkuhn4263]

I just finished putting mine together. This will help. Thanks!

[@JorgeRodriguez-ei2gi]

Great on motorized bike information on tips, thanks, say hello from panama. City.

[@hughstevens510]

I just had another thought too because I'm in the middle of installing another engine on my bike that spring tension guide thing you were talking about if you put that on your bike you'll need to get wide cranks. Because it goes on the outside of the cover where your drive sprocket is and normally the bolts are recessed in your in the cover but when you put that thing on there you can't recess the bolts anymore so they stick out in your cranks won't be able to go all the way around

[@hughstevens510]

Anyway yeah like they said great video I love the way you do your videos and the way you explain the stuff it's perfect for people who don't already know what it is that they're looking at and that's hard to find keep it up man

[@viakion2125]

ive been running my china doll 50cc for 5 years now winter -30 fires right up i got unbreakable one. only haave to replace magneto if rode in water but other then a couple tubes and wheel bearing shes mint

[@jonlloyd1694]

Great information ! Great presentation . Keep up the good job.

[@jamesdoes576]

Not to be disingenuous on your prior knowledge but actually the stalk NT carb is actually more adjustable and works better than the hp carb in some situations. For my cases the NT carb will give your bike more torque and the hp carb I have found to have more smooth response and it caps out faster unless you have a tuned and a good pipe.

[@BenCarano]

Yes! I have definitely found that to be true. Honestly I think the only upgrade that has really made a difference is a better exhaust, but the rest don't really work much better than the stalk components, especially for this particular motorized bike engine. Yah they might add a little more torque, but I personally don't think they're worth the money unless you're in some race and you need to do everything you can to make the bike go faster regardless of how reliable you want the motor to be.

[@hughstevens510]

Two more things any engine you've got that you think might have you know a vacuum leak just start the engine and spray your starter fluid you've got there around the areas where there could be a vacuum leak and if there is a vacuum leak your engine will rev up when you do that. And on the the standard Muffler that they give you with these engines usually there's a screw on there end of it that you can drink it that you can unscrew and pull the guts out of it to clean them too at least I'm part of them yep it was helpful to me just Magneto thing I didn't know and hopefully you know maybe even one of my comments might help you I'm going to try out that new kind of chain guide thingy that I was talking about it looked interesting at least so thank you keep up the good work

[@bmaluginthevanishingman6034]

I fixed it today, the clutch was slipping. It will do every bit of 50 🙏👍

[@kevind1315]

No guy should ever have nails that long, sorry man.

[@BenCarano]

Haha, I play guitar. Yah I guess it's strange to most people 😂

[@dieselgeezer18]

lol what?

[@Jz-sv1ju]

You must play Flamenco style am i right?!?

[@BenCarano]

@@Jz-sv1ju Yah I do a lot of finger picking, feel free to check out my music on my channel, I haven't been good about posting much of that for a while now but I have a few finger picking ones.

[@utilid4lifefigureitout602]

You mean you play guitar... in a drag show on the weekends right. LOL just busting your chops. Definitely not model examples of what mechanics hands look like.

[@jerrellreid8196]

I love the video! It's very clear and informative.

[@flowerpower555]

Everything sounded interesting subscribes in thirty seconds amazing call to action for me

[@BenCarano]

Glad you're interested! I love sharing and doing a lot and I just can't squish myself into a box of only one type of content

[@flowerpower555]

@@BenCarano why squish? we live in an ever expanding universe ! you got this!

[@BenCarano]

@@flowerpower555 Love you! That's just the encouragement I need sometimes lol. I see all these other Content creators speak so highly of having a niche and choosing one thing for the algorithm, but I just cant do that, I thrive on creativity that meets the world in the current day, evolving and changing to continue progressing as a human being!

[@flowerpower555]

@@BenCarano yeah when you feed the thrive in the niche that's wonderful for others, but your thrive fuel matters for you! Creativity is such a diverse area of interest where ideas butterfly effect each other and grow and spread like wild fire!

[@Westhelockpicker]

I still use the NT carburetor I just took off the air filter and put on a velocity stack and then an air filter like the ones that come with the high performance ones

[@Rich-u6u]

Heat weakens magnetism,and can demagnitize a magnetic. Could be your engine is running hotter than normal. Im not sure why it is only the one magnet though?could have something to do with the hot and grounding cycle if that makes any sense? I'm new at this, so I'm just guessing? Check it out !

[@jasonjungmann6264]

I have a 100cc motor bike and only topping out at 20 miles per hour what should I try first

[@BenCarano]

If any of you are interested in links for parts or equipment that I use just let me know and I can post links in the description of this video!

[@stephenallen4813]

Dude thank you so much I opened up my case on the side where the magneto is and fucking oil everywhere that bolt is loose as hell. I had no power

[@BrutusJones]

@ 12:13 I think you meant to say jets range from .61 - .78 that's with a decimal point which is way smaller than 61-78 mm.

[@BenCarano]

Yes definitely

[@chadbrooks3508]

Benjamin thank you so much for your video, time and your knowledge your really help me thank you

[@Denbosch_073]

My bike ran great for 3 days now it will start sometimes but its ticking somewhere, it wont run good and sounds bad. Do you know whats wrong

[@solar3520]

Nice video man. My chain 415 chain snap I replaced it but the engine will not start ? Can the chain snapping damage the engine?

[@BenCarano]

I don't think so, at least I've never heard of that happening, but it's possible that the stress from the chain snapping threw something out of alignment.

[@pauldoyle9210]

what kind of chain or where can I get a single link master link for my 80cc motorized bicycle the engines from China where can I get a chain

[@BenCarano]

@@pauldoyle9210 it will most likely be a 415 chain. what you are looking for is a master link so you can just search for a #415 chain with master link.

[@solar3520]

@@pauldoyle9210 get a 41 roller chain. You can find one at a local store

[@onway78]

First time riding one first time building one but mine do not stay idle at all soon as I soon as it starts up and runs but when I hit the clutch to stop at a stop light or stop sign it shuts off

[@BenCarano]

That's what happened a lot with mine where it would stall out and loose power, so I made this video with a lot of the procedures I went through to stop that from happening and fix it. However, sometimes these two stroke engines just aren't the best quality and they can be defective.

[@onway78]

@@BenCarano I thought it is affected I contact the seller but he won't send me another one so I guess I'm stuck with this one,any how what did you do to fix yours? If you don't mine me ask

[@BenCarano]

@@onway78 what worked best for me was putting a good spark plug in it, replacing the piston housing and rings, and replacing the magneto. I wish you luck and hope you can save it!!

[@DonPilosky]

Very well done! Good info

[@bo-boboski4118]

My 66cc is not turning off when i lift the choke l to turn it off. It just revs higher. Thwre are no airleaks. Can somebody help me out

[@viakion2125]

ur button broke for shutting spark off?

[@randipaigeturnercreighton5786]

Ok I just put this motor on and it's not firing well expiring it stays cranked for a few seconds but it won't give it gas just like it it just won't give it fuel what does that sound like to you and how do I fix it

[@dustinplee5067]

and after I put the chain on it won’t roll the tire when I try to roll the bicycle the back wheel just locks up and what’s to slide on the ground how can I fix that and when I flip the bike over and move the wheel it wants to act like it’s going to start but when I put it on the ground it just skid on the ground

[@debraresweber5676]

My boy friend has a 80cc motorized bike &his chain came off &he could not get the motor to shut off even after he pulled the spark plug wire why would it do this he says it is impossible to of happened.

[@viakion2125]

impossible but spark can jump

[@bmaluginthevanishingman6034]

Sorry I got the DVR tuning and it just died on me going down the street so just be on the safe side I ordered a new CDI Magneto and carburetor it's all on it now and I still can't get it started now I made a makeshift head gasket out of an aluminum can and Monday my real head gaskets are coming do you think that could be the problem

[@BenCarano]

could be gaskets or even piton rings

[@benvarela4077]

If my exhaust pipe has lots of fuel and oil buildup inside will this keep my 2 stroke engine from starting?

[@BenCarano]

potentially, it limits the air flow which could definitely effect the start up and running of the engine

[@callum8143]

Just subbed, I'm interested to see the other 2 stroke engines you was on about at the end of the vid :p

[@BenCarano]

Absolutely, I'd be happy to do a video about that!

[@marlonblanchard5463]

Great video man, very helpful, Thanks

[@patrickcobb7904]

Have u ever have pull start problems like way too much compression. When you pull the plug it pulls real easy you put the plug in that don't want to pull start at all exhaust and intake parts are clear

[@luisrosario788]

My bike bogs at high speeds and sometimes once I launch it to turn on it idles well and great but when I rev it jerks and the bike loses power all I can do is idle it

[@BenCarano]

Unfortunately the only advice for that is to replace your piston rings and housing, and hope for the best. That is a common problem that can cause that, but it may come down to having to get a new engine. Best of luck!

[@MattC78]

The float in the carburetor may be sinking. try replacing the float.

[@ExpatScoti]

the cable may lose the rubber when oil drops onto it due to the vibration and movement against the bit it clips into.

[@paulb9651]

can you help. my muffler gasket keeps burning out after 2 months riding it and screws get lose

[@BenCarano]

use blue lock tight on the screws and replace it with a copper gasket

[@nickneubauer1420]

Where can I get a cdi or magneto? I just got one of these bikes and I want to get it running. I'm not getting any spark. Where should I start? Thanks for any advice you can give me.

[@Shae_518]

The chain to my clutch/transmission is broken.., do u know where I could order a smaller thicker chain to fit it I’ve been to plenty of bike shops and ordered online from different sites and I have no idea where to get the chain I need, it’s a 80cc 4 stroke kit and I need some help finding a chain so I can’t get the bike moving

[@BenCarano]

I think it’s a number 42 chain

[@bobobair]

Really great information .jus my pet pev is them fingers nails

[@judecapone7651]

My guess would be he is a finger-picking guitarist or classical.

[@gunbuster333SMSTI]

I know right😂

[@dorianfoster8107]

What are the screws called that holds the cover on the motor, 2 of mine are missing can anybody help

[@BenCarano]

Mine are just fillips head screws, if they are missing though I'd recommend replacing them with Allen key ones so they don't strip out

[@jahatton]

The other day my motorized bicycle started having issues to keep running. I at the time suspected bad fuel so I switched out the gas with a fresh batch and all was good... later the problem came back and I was back at square one! Yesterday I had a good ride without a problem only to have to limp home with a major issue. I cleaned the carb out and blew air through it to make sure there wasn't an obstruction. Next I looked at the spark plug, I replaced the factory cheap plug with one from a chainsaw. That was in prestine shape... test for spark??? No spark! I suspected a bad CDI ignition a few days ago and ordered a backup. Next I opened the magneto cover to see if something was grounding out.. When the cover came off the entire compartment was full of fuel! Now I suspect a bad seal! On inspection I found that the seal was not far enough in and the shaft was exposed on the end. Decided to first reseat the seal by tapping it farther in. I blew out the magnet and magneto the best I could and tried to run it. She fired up right away and ran reliably! I took it on a short run to see if there would be any fuel leaking out and found none. Problem was solved! Had I found this video earlier I would have had the motor problem fixed last week! Hope this helps someone in the future. 🙂

[@BenCarano]

glad you got it working mate!

[@ultimateearrapechannel31]

Hello, does the banana exhaust give me more power than my modified (pipe cutted) stock exhaust? And why does my kit not like to accelerate from idle (standing still)? It always shuts off when I try that. Or is it just me having 0 experience with riding motorized vehicles

[@billymorris-watts3766]

Instant sub great video

[@BenCarano]

Thanks! Glad it was helpful :)

[@januaryblack2021]

I installed my 80cc, when i release my clutch the back wheels freezes up

[@nikkogrimaldi4678]

Your Very Smart! Thank You For Your knowledge. Very Awesome!!

[@vancegravley5208]

I bought a $110 engine kit on Amazon the Piston does not want to fire and fires at the wrong time making a unique sound I really need someone to tell me if it's the CDI or the moter

[@viakion2125]

verify the magnet is on right with the key

[@IRL100]

My Problem is whhen i drop my bicycle the engien go off pls help me

[@OutlawRC]

These motors can last a very long time if you buy the right ones. Usually 5000-9000 miles though there is one documentation of one lasting 30,000 miles and still going. Other than that this is an alright video. Thanks

[@catsbyondrepair]

They gall wrist pins like nobodies business they last about a year before they need a top end rebuild

[@davewalterrobinson5474]

I lunched a vintage 2 stroke snowmobile engine using too much starter fluid. There is no oil mix

[@michaelheal943]

Nice thinking

[@chadmcgarry9571]

Thanks for the vid. Very nicely done

[@flynnlee2378]

I’m having a problem with my bike. So I recently got my 80cc bike going and it was running smooth and was pretty powerful, it’s still in the break in stage but I leaned against the wall and it fell and I forgot to turn off the petcock so it flooded, I managed to get the bike running and it burned all the fuel out of the cylinder, it started to burn a lot of oil so I changed the mix to 25:1 instead of 20:1 and it seemed to smoke less but now when ever I go about mid speed it starts to shudder back and forth and the only way the stop it is to pull the clutch in. It will set off and run smooth at around running speed but any faster and it starts to shudder even with the clutch not fully engaged. Any thoughts?

[@BenCarano]

Honestly that was the same kind of problem I started having before I decided to build my 4 stroke 120cc bike. My 80cc started doing exactly that, and it's usually fixable, but there's no guarantee. If I were you, I would try replacing the cylinder housing as well as the piston rings. Sometimes overtime when the aluminum heats up, it can warp which can throw things out of alignment. You could also take the engine apart and check for any carbon buildup, as you said it was flooded and even if you burned off the excess fuel and oil, there might be more carbon build-up as a result. Hopefully this helps! And good luck!!

[@flynnlee2378]

Benjamin Carano Thanks for the advice, I did notice a lot of thick black oil build up in the exhaust which might have something to do with it being flooded and it was running way too rich at one point, I moved the E clamp on the needle up one so it’s running a lot better now and there’s also less smoke coming out the exhaust. I’ve noticed when I start to get on the throttle and it shakes if I just coast for a few seconds with the clutch still engaged and then get on the gas again the shuddering seems to go away or atleast be only a little bit there. I’ll definitely crack open the engine and have a look, I’m not sure wether it would have warped since it’s only been ridden about maybe 1 tank worth of fuel and not for a long period of time but yeh I guess cheap Chinese motors probably would.

[@BenCarano]

@@flynnlee2378 yah it shouldn't have warped then, but it's possible. Hopefully you can get it working!

[@flynnlee2378]

Benjamin Carano Hopefully it’s not ,Thanks for the helpfull advice, I’ve only found ur channel yesterday and I love the content, keep the motorised bike stuff coming, love from Perth, Australia

[@flynnlee2378]

just a update if anyone’s wondering I Think it was doing the shuddering thing due to a very weak spark. One side of the magneto magnet is weaker than the other which might be causing the weak spark. Today I cracked open the magneto case and took the magneto out and then sanded down the the back and front of it to get a better connection because there’s sorta coating on it from factory. So far I’ve tested it and it seems fine without a new magneto magnet. I may still need to order a new one which would be a shame due to this corona virus thing because it means delivery’s are 2-3 weeks longer for me even if they are based in Australia which is where I live. I have ordered a new NGK B6HS spark plug and am planning to put a BBR stage 1 or 2 CDI in the future.

[@bmaluginthevanishingman6034]

Hey what's up I got a DIY 80cc motorized bicycle. Got everything put together and can't get it to start so I ordered a new CDI put it on I've got a spark still not wanting to start now should I just keep trying it and trying it cuz it's a new engine until it eventually turns over it's getting gas I mean it's basically doing everything it needs to be doing to start it's just not starting the throttle is hooked up everything to the max the clutches at the right spot.

[@BenCarano]

if its one of the 2 strokes like I have, they can literally be made wrong new out of the box. Had to get 2 of the cheap ones before I could get one to work. Never had this problem with any other engine except for this type. Not sure why. Good luck though!!

[@bmaluginthevanishingman6034]

@@BenCarano I ordered the package expecting to get the picture that was represented but no it had no motor decal on it it was a totally different color.

[@BenCarano]

@@bmaluginthevanishingman6034 Yah That was similar to my experience. That's the whole reason I did the honda 120 cc build

[@pearlcullen8267]

when my motor kicks on i need my peddles to not spin...what do i need for this not to happen? i believe its a chain that goes from the peddle to the motor

[@BenCarano]

Yes I know exactly what your talking about! You will need a free hub sprocket for your pedals. They are probably a bit harder to find now though with covid.

[@pearlcullen8267]

Thank you so much!

[@BenCarano]

@@pearlcullen8267 Sure, hopefully that helps. I haven't done that myself so I'm sorry I can give you a link or make it easier, but you should be able to find something!

[@pearlcullen8267]

@@BenCarano could you please send me a link n video? Once again thank you for all the help... ur awesome!!

[@BenCarano]

@@pearlcullen8267 Unfortunately I couldn't find anything with a quick search, but I remember seeing one before somewhere, so I will let you know if I find anything!

[@SPEEDYTHEROBOT]

Heyy man i can’t get mine to work I bought it brand new and I followed all the steps but I notice when I put the spark plug in the engine doesn’t want to run and then when I take the spark plug out the engine runs perfectly but when the spark plug isn’t in the engine all the air come out from where the spark plug goes instead do you know why is it doing this ?

[@rileyschuh4192]

im having a problem. something is clinking pretty loud when the engine is off and the clutch is in just riding it normally. i checked for any chain rubbing and cant diagnose it. any suggestions?

[@BenCarano]

I wouldn't be able to pin point the exact problem with that as it never happened to me, but my best guess is that it could either be a bad bearing that causes the shaft to shake around a little, or it could potentially be a loose gear in the gear case of the motor. I would take it apart and check that all the bolts are tight and nothing is physically broken. Hopefully that helps

[@lewisheilig9827]

is it the muffler cooling off ?

[@siga123voitk2]

What to do if it only wants to run in high rpm and when you let go of the gas it starts shooting gas out of the carb and tries to stall i have tried many carb adjusments and still does the same

[@BenCarano]

That sounds like you need a smaller fuel jet, but not sure entirely, could also be a bad spark plug

[@siga123voitk2]

@@BenCarano figured it out i did not put a exhaust gasket on and it did not want to run beacuse of it when i put it on it ran like nothing had ever happend to it😂

[@siga123voitk2]

@@BenCarano and now the cylinder craked from the inside but no problem new cylinder bought already😂😂

[@jerrichilcott4861]

just replaced almost everything on my bike motor but she still wont run it sounds like its trying to turn over but then dies down any ideas

[@BenCarano]

at that point you're probably looking at a new motor if you have tried everything, sometimes these ones just go bad

[@jerrichilcott4861]

@@BenCarano yikes

[@madmanjames1606]

I just rebuilt my bike I did a top end new piston and head didn’t start after bought a new carb and exhaust and wouldn’t start changed the cdi and spark plug

[@angie4567B]

hi there. i have a nt motorized bike, I got it back from the mechanic that builds these things and Im still having issues. plug keeps clogging up with oil, oil spraying over the exhaust manifold. i cleaned the exhaust out, cleaned the sparkplug, cleaned airfilter. after doing that, took it out for 12 minutes and it was perfect, then it started its clogging again. I have changed the mix from 25 mls to a litre, down to 20mls to a litre and still no change. what is even more weird is, when i turn the fuelcap to off before stopping, as it runs dry, the bike goes back to normal with the last remaining fuel, any idea whats going on?

[@BenCarano]

Have you adjusted the carburetor jets?

[@angie4567B]

@@BenCarano thank you for such a quick response, much appreciated 😀. I have the jet clip set to 2nd last to bottom, was thinking maybe I move the clip to 2nd from top ( there are 5 notches ), but then I thought why don’t I just decrease the fuel mix until I get the mix right. However, my concern is, I then might be starving it of oil and maybe damaging the engine by ie, seizing engine due to lack of oil🤔🙈

[@BenCarano]

@@angie4567B yah it can be finicky! I’d recommend a carburetor with actual fuel jets rather than the pin, you can have more control over it. Otherwise best of luck! Sometimes those engines just don’t want to run I’ve found, that’s the whole reason I did the Honda build

[@angie4567B]

@@BenCarano thanks for the info. Before I change the carb, I'm thinking it could be the CDI unit. Possibility not enough spark to the plug. So tomorrow, I'm buying supposedly the correct one from the guy that fixed it, if that doesn't pan out, I believe you can test the plug in the dark, by placing the sparkplug to the side of the engine and if it sparks blue, your apparently OK, if yellow, CDI unit replacement. I'm determined to get this sorted out, if I have to get a jet carb, so be it, but I'm not letting this get to me.

[@larryshaver3568]

is there a gasket between both halves of the engine? i couldn't see any

[@BenCarano]

There is, it is just the stock one though and it is hard to see, I would recommend getting copper ones as an upgrade!

[@michaelmarino80]

What kind of rims are those?

[@BenCarano]

Velocity for the rear, and mavic for the front

[@OnlyToasted]

I could use some help. This is my first build and I just finished last night. I just got it started but it was instantly full throttle and it would stop. I held down the clutch and the engine eventually just stopped. I don’t think the throttle wore inside the cable is long enough because the throttle will only spin about a centimeter. Any tips?

[@BenCarano]

Throttle is probably too short or the idle speed is too high. there are two adjustments for changing the length of the cable, one at the throttle grip and one at the carburetor. there is also an idle speed adjustment screw on the carburetor: turning it in will increase idle speed and turning it out will decrease it. It could also be that they just sent you the wrong size cable if none of the adjustments help. I haven't had much luck with the stock throttle assemblies myself.

[@normanwray1341]

True true good 👍 to know.

[@hunterk03]

Good info. Thanks!

[@albertmichall5732]

Thank you , Ben Good job are you still in CO

[@BenCarano]

Glad you enjoyed it! Yes I am still in Colorado a lot

[@MeiGunner]

The throttle cords like that so when you turn the handlebars your engine doesn't rev up

[@samuelbrowand6888]

Put your old magnet on your steel door of refrigerator door an leave there for a couple months. It will even out. It may even out quicker i don't know. Mine was there a year when i noticed the fix.

[@BenCarano]

Oh nice trick!

[@rudedog2378]

Informative , i sold gave away or threw away every thing i had for these engines , to me they are just that bad.

[@rudedog2378]

Try a Hua Sheng 142 , ultra reliaible

[@glennspears839]

Your not to hot yourself. More money than brains I bet........

[@stormy4269]

With my engine kit I bought I had to replace my Ignition coil, my spark plug, and my magneto coil because it wouldn’t fire at all. At that time I had just got it a few days before. Also I have a question, my choke keeps turning on when I’m going medium speed which I don’t really want because then that kills the engine. Any idea on how to fix that? I have that stock carburetor.

[@BenCarano]

Yah my only suggestion with the choke stock carburetor is that you could either bend it in someway that it is harder to move and stays, or you could rig up something with rubber bands

[@stormy4269]

Benjamin Carano Alright! Thanks a bunch

[@stormy4269]

Benjamin Carano Hi again! I was thinking about upgrading to a better carburetor I would like one with an automatic choke. Any suggestions??

[@BenCarano]

@@stormy4269 This is the one I got with the automatic choke release www.bikeberry.com/66-80cc-high-performance-carburetor.html

[@awakenotwoke2643]

Take air filter off and "tighten" bolt a bit

[@lil-negro]

Mi 80cc bike turns off when it gets warm. when it is cold it starts wight up what i can do?

[@BenCarano]

That is probably a carburetor adjustment to make the bike run better when it is warmer out. When it is cold the oxygen is more dense making some engines run better. This can be adjusted in the fuel and air mixture adjustments in the carburetor to take that into account and run better when the oxygen is less dense.

[@lil-negro]

It doesn't work i have tried an hour to adjust this one crab screw but it doesn't help. When the engine gets warm it turns off. Can the problem be this little magnetic flywheel?

[@BenCarano]

@@lil-negro it's not the screw that you will most likely need to adjust, It will probably be the fuel jets or fuel pin.

[@lil-negro]

Ok

[@ricksanches8258]

Rite on keep doin your thing

[@juststartsomewhere9089]

Damn dude. You know you only need one coke nail right? Lmfao just kidding bro great info rock them edward scissor hands!

[@dehoedisc7247]

Air, Fuel, and Spark? Not quite. Air/Fuel Mixture, Spark, and....Accurate Valve Timing ( with sufficient compression).

[@BenCarano]

yes, to be more accurate you are correct

[@generalgrievousproductions]

I'm having a problem with my newly purchased motorized bike. I just bought it recently, haven't really rode it much. It's not brand new, either. Basically, the rear wheel is completely seized up, even when I pull the clutch in. I've taken the clutch apart to try and free it, but to no avail. What should I do?

[@magicman0867]

The great Chester take the nut out the clutch and pull the clutch cable it should have some give if not unscrew the bolt and try again

[@00recon]

If it has a coaster brake it may be seized up.

[@johndawd4616]

The last thing (the Mac spray bottle) is pretty much stupid stuff, use a carb cleaner instead and it will work the same.

[@macandmall]

The best fuel spray to use is your gas oil mix you put in the tank. Put that mixture in a oil can that has the little lever pump and spout. Any of those spray cans have no oil, it will literally wash the oil off the cylinder wall and piston. If ran long enough on that, piston will seize in cylinder

[@MeiGunner]

The magnet gets less magnetic because of the heat you must run it hot

[@Neisha11201999]

What does it mean when my motorized bicycle wont stay running

[@jonasbartasevicius3197]

I think you need to ajust carburator bolt maybe its to lean or to rich

[@jonasbartasevicius3197]

I am not expert just guessing

[@lewisheilig9827]

clean the carb water?

[@ioangogov162]

Carb choke?

[@larryshaver3568]

is thhat a 6 volt or a 12 volt magneto? i'd like to put a 12 volt magneto on my engine so i'll have ample power for lights as well as the cdi

[@BenCarano]

This one is the upgraded 12 volt! Yah lights would be a great upgrade!

[@larryshaver3568]

@@BenCarano true, batteries are getting ridiculous again but I'm thinking about using a generator set for lights. even thought they produce AC they still are cheaper than batteries

[@BenCarano]

@@larryshaver3568 yes for sure the better option

[@johndeere1174]

You have long manicured fingernails man, my wife is jealous. Good bike vid

[@BenCarano]

Haha yep I play finger style guitar so that’s why.

[@martingannon132]

If you want a lot more power get a fat magneto or it's called a super magneto it just has more turns on it but you can really tell a difference. Try it!!!

[@nathancarter3568]

I just put new carb on Nd now it won’t start

[@JorgeRodriguez-ei2gi]

Mr carano, yes we are glad, if you post us your link fescription of parts you buy on your videos, thanks, let we have those links, thanks, joe.

[@BenCarano]

Links to the parts are in part 1 of how to build it

[@willardbuchanan9122]

eBay sells Jets all the way down to 50

[@BenCarano]

Awesome! Even better if needed

[@davidbean5621]

I'm at 876ft above sea level what jet would you use for my hp carb from Ohio

[@BenCarano]

I would go with a 76 or 78. I can't tell you for sure, because I live 7000 feet above sea level and a 65 to 68 is best for me, so I can only assume. However, you could look up a dirt bike jetting chart and compare the ratios.

[@davidbean5621]

Thanks man good looking out man

[@dariussykes5798]

You forgot you can change the jets on the NT Carbs

[@darrenlind3088]

How much for the cdi

[@BenCarano]

the one I have is about $20

[@TH-ut6ok]

13:50 ~ C-clip

[@darnelljackson1556]

What if it runs off str8 gas

[@BenCarano]

You will harm the engine! It needs to be lubricated. However these engines tend to break down so fast anyway that idk LOL!

[@Area-cf1gt]

Guess i dont need compression for my bike to run lol i may drill my piston to lighten it up 🤞

[@BenCarano]

🤣