The Secrets of Minibike Gearing
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- Опубліковано 30 вер 2024
- You don't need to spend a lot of money on engine upgrades. You can add speed and power to your minibike with simple gearing changes.
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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 😊
Yeah bro im building one right now just convinced my parents
Your mom was probably the funnest person to be around at parties
Hats off to whoever invented the torque converter! Great breakdown of some fairly complex concepts Lou!
The best part you can ever put on a mini bike or go kart
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 UA-cam in my opinion for explaining how all of these different parts / systems work together.
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! 👍
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.
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
What's the top speed?
@@mogong7260 About 45mph, I no longer have the bike, cops impounded it and refuse to give it back lol be careful out there
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
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?
Yes, 20% faster. 20% less torque
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!
oh no you lost the chain on the top speed run. you cant fool my ptsd!
Damn! Good ear!! Sure did. Scary
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
The DB200 uses 420 chain and you should stick with that. So get a 60T-420 sprocket, some extra 420 chain, and a chain breaker tool.
I would love to know where he bought that jackshaft with the aluminum back plate, if anyone knows.
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? 😂😂
Yessir! Proud member of Minibike Newbies.... great video bud!
Bridgeport milling machines use the same concept to control spindle speed, cool idea
So essentially for me to be able to wheelie I need a bigger sprocket
soo... basically get a torque converter XD
awesome and really helpful video!
Pretty much!
torque converter will lose you top speed for any given ratio, due to the extra friction. That's why all the racers use fancy disk clutches like the Noram Cheetah.
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.
Your belt is facing the wrong direction
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.
You can’t get a jackshaft sprocket with less than 10 teeth. Yep, replace your 50T with 60T. That will give you 20% more torque and 20% less speed.
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
A bigger back sprocket will give you more torque and less speed. A torque converter will give you even more torque, with less speed loss.
People that choose speed over torque 🤡
Well done straight forward video brother.
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 😂
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
Add a juggernaut driver and it gets even better
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 …
rember ur weight plays there to bcuz more weight more stress less weight less stress
That’s exactly right. The more you weigh, the more you will want to gear towards torque.
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.
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.
Its in the video description of this video.
ua-cam.com/video/GScvHAnYWZQ/v-deo.html
Thank you very much.
@5:00 mark I see the belt is on backwards, and, the clip on the master link is also on backwards.
The belt is on correctly. Flat side towards the motor. You are probably right about the master link. I don’t pay attention to that. I probably should, but have never had a problem.
Besides the obvious, the belt says "this side to engine" is pointed the opposite way. Just a safety concern. That belt being on wrong and it rolls upside down and Flys apart, it's going to hurt like heck at best. worse case the eyes. A one inch peice at 5k rpm will hurt and bruise you pretty bad.
And at the 5:15 mark the arrows are now pointing towards the engine. 🥳.
really great job Sr
Belt just needs to be flipped around. It say this side towards engine. I’m sure you fixed it by now
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?
1 - I used the same chain. Just loosened slightly.
2 - The RPMs will not go past the governor limit.
the governor will limit the engine rpm. regardless of the sprockets as it governs engine by merely closing the butterfly in the carburator
i wouldnt know about the chain though but it not difficult to modify the chain length theres plenty videos that show how to shorten a chain not many showing how to add a link though
Did the bike blow up when you where going 40 lol
Good ear. The chain popped off and got tangled in the rear sprocket bolts
What’s the black bike with Colman forks and a swing arm at 1:30 into the vid?
Good video 👍🏁
Awesome info and video!
Do I have to use a 420 chain with the 11 tooth sprocket and 30 series torque converter?
could i use a tourqe converter with an electric bike?
No
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?
Small to big = torque
Big to small = speed
Larger rear sprocket will give more low end grunt
Going smaller on "driver" side will tack out the engine very quickly.
We used this combo: 212cc
Driver vs. Driven = speed
14 60 44 mph
12 60 37
10 60 31
8 60 23-25
Pops wheelies constantly not user friendly
11 50 33-34
Best set up so far
what was that holding the chain together ?
A zip tie
do you recommend doing that
20mph? Mine does 60+ with no problems at all
What’s your setup? Or stock?
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
Higher cc's = more power
More power = achieving Max mechanically limited speed faster or sooner
Gearing will be your limiting factor
You got the power, so now you mess with drive /driven sprockets
Start in rear first 10 teeth change is huge
60 tooth to 50 tooth...is almost 20% gain in speed...but 20% loss in torque
So that's huge
@@MH-pc2ky hey man I really appreciate you breaking it down like that to illustrate an awesome explanation of understanding thank you sincerely
Excellent video 👍🇨🇦
Just got in to mini bike you got me thinking 🤔 thanks
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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?
mine went from 48 to 41 with torque converter and the 10 less back teeth 😂 i’m sad now that made the vm carb seem like a waste of money i’m putting the 50 tooth stock back on 😢 but almost 50 mph isn’t bad for only bolt ons nothing internal done to the 196
@@robertbruhcuh3634 oh man what a throw back comment (even though it was only 9 months ago) now I have 3 mini bajas, one has the 40t one has a 50t and the last one has a 60t 👌 gotta love variety
@@JJC991 lmao yeah what was yours doing with a 40 tooth? i think the engine isn’t good enough for the gears i got it did 48 with 50 tooth now it’s loss the amount of speed i wanted to get from it
@@robertbruhcuh3634I have mixed results, so I weigh about 230lbs, with the 40T and stage 1 I hit 85km/h @3800rpm(212cc)maxed out, no governor
50T has stage 1 and mikuni and I hit 75km/h @4200rpm (212cc) with no governor
I think the 40T would wakeup if I weighed less but for my weight the 50t is more reasonable.
Both bikes run a CVT with 10T front gear / sprocket.
My 60T bike is a little different. It only has a pod filter / straight pipe header, but a 420cc engine with a 14T clutch (no CVT) with the governor still intact (3400rpm) I max out at 65km/h. I'd imagine it would go over 100 km/h without the governor, but I don't wanna die 😂 it has twice the torque as my other 212s
More speed: 18-32
For any bike?
What is the best gearing, Stock predator 212 straight chain
10/70 is good. 10/60 is ok, but slow starts.
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 be so annoying? Why care so much about another persons bike? Why so many questions?
@@tyler6602 Why would I be upset? I just don't like the style of the bike or the shape of the tank, should I worry? No, it's just an opinion, I highlighted only a few details that I didn't like, the bike is fat and heavy, it's a bit difficult to lift, the tank is small and useless if you want to use it as long-term transportation, and the exhaust is very noisy. because of the power it has. Maybe I don't think you understand my point here, you gringo.
@@tyler6602 I am making a motorcycle with bicycle parts, ugh I would like to have that privilege from you of being able to buy such important parts for the assembly of these motorcycles, but you do what you can for little money.
@@tyler6602 The end are opinions that a gringo would not understand xd
@@tyler6602 One question, is it the norm that all of you have a garage?
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?
If you are asking about the stock Coleman jackshaft the 8 and 9 tooth sprockets available may not fit the metric jackshaft properly. Easiest way to more torque is a 60 tooth sprocket and longer chain whether you are using a jackshaft or a torque converter. Gearing cannot change the engines HP but can limit power available.
My experience with the Coleman bikes tells me that once I got the gearing to where I want it there's no need for a big power engine for it to be fun. Gearing is important for minibikes and go karts.