The Secrets of Minibike Gearing 

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My mom wouldn’t let me have a Minibike, im 53 now and building a classic style mini bike, thank you for your free advice 😊

I have watched countless minibike videos and builds, and none of them have covered as much ground as this one. This is the best mini bike video on RU-vid in my opinion for explaining how all of these different parts / systems work together.

Hats off to whoever invented the torque converter! Great breakdown of some fairly complex concepts Lou!

I have a bt200x mini bike, and I just swapped it with a 224cc max performance predator engine. I have to find the right size torque converter for it than I can ride it a more than double the speed. This video kind of clarified what type of gearing I need so thank you! 👍

I’m trying to get my son’s 100cc minibike to climb hills and trail ride better. Thank you so much for posting this video.

Yessir! Proud member of Minibike Newbies.... great video bud!

Good info! The torque converter is king for obvious reasons. I actually have a ct200u, and just installed a torque converter with the 5 to 1 gearing and 19 inch tire. Take a look at the yellow Secondary spring, it helps greatly to keep the rpms up. And also a true comet belt seems to be the ticket! The cheap ones flex too much and don't achieve full shift out.

Needing a running start to do the speed test @ 2;45 reminded me of the Isle of Mann races & particularly back when the bikes were 2 strokes but needed to be pushed to get it rolling but then they went like a bat outta hell w/ a high revving engine. I'm not quite sure how that relates to this but them pushing the bikes to get going is what caught my attention. Anyhoo, I'm watching to learn something..... peace

for those that are confused by this video the colemans in all stock form have a gear ratio of 10 to 1 thats a pretty good all around gear ratio its good for startin off on a hill but it doesnt offer much in the way of speed the governor in my bike is defective so i get a top speed of 25 M.P.H. on flat ground others report like 13 mph. with a properly working governor the way i determined the 10/1 gear ratio is is by turning the clutch untill the rear tire made one full revolution i ride my bike on dirt roads an honestly i rarely hold full throttle for more than a few seconds because of the ever changing road conditions it literally goes from hard pack scattered with loose rock to mostly hard packed white with random loose spots to a creek crossing then hard packed red clay with ruts then a long moderately steep grade that being said 10/1 gearing is an excellent choice for that

That was super informative and well done. Thanks!

i just put a 60t rear sprocket on mine and with the stock 98cc motor, it has almost zero torque but it was the best thing ever because i can easily keep up with traffic on the road

Bridgeport milling machines use the same concept to control spindle speed, cool idea

I had a Lil Indian when I was a teenager. My friend had an orange early 70s, Sears mini bike. We used to duct tape one of those big ole' square flash lights on our front fenders and cruise around the neighborhoods at night. Neighbors probably thought, who the heck is mowing their lawn at this hour? 😂😂

Got a 212 with the governor removed, header, carb and flywheel now on my little oryxearth that had a 105.. looks almost exactly like that little mega Moto frame, thing absolutely rips now😂 think I’ll pop the crankcase back off after a while and rebuild the whole motor then throw on a torque converter with a 60-65 back sprocket. Perfect mini trail bike. Fits in the back seat of my car 😂

Seems like the 2 speed centrifugal jackshaft was the best of both worlds. Too bad they can't make one of those where the first gear is a torque converter, with a solid lockout overdrive.

soo... basically get a torque converter XD awesome and really helpful video!

Well done straight forward video brother.

really great job Sr

I would love to know where he bought that jackshaft with the aluminum back plate, if anyone knows.

Awesome info and video!

Best gearing for a monstermoto 80 w a predator 212 on it 22lb springs, flywheel, rod, upgraded mikuni vm22 carb 125 main jet im running a 10 clutch 40 sprocket

Just got in to mini bike you got me thinking 🤔 thanks

I enjoyed the video. Sounds like the torque converter is best but if I just wanted a little more hill climbing power without spending a lot of money what do you recommend? I have a Coleman ct200. Is it best to put a little larger rear sprocket or a smaller clutch sprocket. I don’t care if I loose a little top end speed. Thanks.

@5:00 mark I see the belt is on backwards, and, the clip on the master link is also on backwards.

do you have a video showing the different holes on the TC? i want to see how much faster the “SPEED” hole is VS the “TORQUE” hole regarding top end. i’m looking for a little more torque but overall more top end… just busted my chain so i want to upgrade sprocket while i’m at it but that take off on the straight chain is just too slow for me …

Good video 👍🏁

I was on there website looking at the kit and it says it has a small, medium, large plate based on the boss for jackshaft. What is the boss? Says there's a 2" and 3 1/2".

Excellent video. Do you have the link where we can get the proper torque converter and sprocket for the Coleman BT 200x? Thank you.

Do I have to use a 420 chain with the 11 tooth sprocket and 30 series torque converter?

Doesn't it just change the gear ratios when you hit a certain rpm. rather then change the torque of the engine ??

So on my mini bike I put a 224 predator with a 30 series torque converter. Stage 1 intake & exhaust. 10 tooth sprocket up front with a 72 tooth sprocket in the rear for max torque. Surprised that I hit a top speed of 41mph running 21” tires. Not looking for speed with this build- Going to an 8 tooth sprocket up front for all kinds of insane hill climbing torque..thoughts?

I just have the centrifugal clutch and single chain setup with stage one kit it does start slow ish how can I gear it for 10% more torque like you were saying

Add a juggernaut driver and it gets even better

What’s the black bike with Colman forks and a swing arm at 1:30 into the vid?

Excellent video 👍🇨🇦

I am running 12t on the front with a horstman x5 racing clutch. And a 65t rear split sprocket. If I cut down to a 53t rear split sprocket would I go faster?

How does some of the Coleman 196cc only go around 24 mph but other dirt bikes with a 50cc say it will go up to 60mph I don’t understand how that makes sense. I thought the higher cc led to higher speeds

What is the best gearing, Stock predator 212 straight chain

So essentially for me to be able to wheelie I need a bigger sprocket

Belt just needs to be flipped around. It say this side towards engine. I’m sure you fixed it by now

what was that holding the chain together ?

oh no you lost the chain on the top speed run. you cant fool my ptsd!

could i use a tourqe converter with an electric bike?

Hey man, I have a similar bike / setup (50tooth rear sprocket and same torque converter / CVT) But I just ordered a 40T sprocket to try out. Any idea how much of a difference it'll make on the top end?

Your belt is facing the wrong direction

rember ur weight plays there to bcuz more weight more stress less weight less stress

Did the bike blow up when you where going 40 lol

20mph? Mine does 60+ with no problems at all

More speed: 18-32

People that choose speed over torque 🤡

wow it's so ugly, why pretend it has a motorcycle tank? And why not put an exhaust more suitable for the engine you have? And why have such fat tires?

why are you riding with your feet /legs just dangling behind you? why not put them on the pegs? very odd way to ride a bike.

So if i want more torque, get less teeth gear for jack shaft/more teeth on wheel? Say 10 tooth gear and 50 tooth, is there such a thing as 9 or 8 tooth gear? And would that change chain length? Does it affect horsepower? Would i need more horsepower for more torque?

I have a taotao db200 I want a 60 tooth should I go 40 chain? What chain should I use when I go up to a 60t

A few questions 1.) When you go from the 10 tooth to the 11 tooth on the torque converter do you have to change chain size or the same chain will still fit? Also 2.) When you go from the 10 to the 11 tooth on the torque converter does that make the engine rpm go up? If so should I worry about the engine spinning to fast on stock internal parts? Or will it still not spin faster than the governor allows and still go faster mph?