Coleman rt200 tav 2 gearing

Faolan

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Currently have 19 inch wheels, tav2 10 tooth front 50 tooth rear. I know normally for more too speed you go higher in gear ratio, so I’d drop rear sprocket size.

I’ve heard people talk about actually going up to a 60 tooth to gain more speed as the engine will rev higher. I have a stage 1 212 predator with the governor set at 4500 and I don’t max the governor out anymore.

I currently go 43mph top speed so far and would like a little more torque and speed. Would the 60 tooth do as others have said and let the engine rev higher therefore giving me more top end and button end?
 

Faolan

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As it turns out I can only find a 53 tooth sprocket for these bikes (3 bolt pattern) Don’t think it’s worth $40 for a .3 reduction.
 

madprofessor

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Bikes, 3-bolt pattern, ??? I'm lost. what are you riding/driving? Minibike, trike?
3-bolt refers to your wheels, correct? Is rear sprocket attached to a wheel? Alone on an axle?
 

karl

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This is what your looking for.

https://www.gopowersports.com/universal-sprocket-adapter-8-wheels/

It lets you use the professor's favorite sprocket type, the split sprocket.

Available in 42-68 tooth

https://www.gopowersports.com/split-sprocket-41-420

Or you can pick up a 9t drive sprocket, one tooth on the drive sprocket makes a much bigger
impact than a tooth on the driven. And just keep the factory rear.

https://www.gopowersports.com/9t-5-8b-41p-sprocket/

Yeah the sprocket may have a tad bit shorter life for it and potentially the chain,
but Ive put many miles on my monster moto 212cc with that setup,
still have the factory chain on the bike. The motor runs 12:1 and spins over 7k.
 

madprofessor

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If link above for 53-tooth is correct, this sprocket with the 60-tooth option should match that (2") bolt circle with a little force (1.965"). Says it won't work with RT200, but I'm 99% sure that's because the larger O.D. will hit the chain guard. Have to modify that....................
Mini Bike 6 Hole 420 Sprocket - GoPowerSports.com
Failing that, this adapter plate (2.2" circle needs some drilling for 2" pattern) will let you slap on or swap out split sprockets of your choice (up to 68-tooth with link at bottom) in 5 minutes flat. Definitely gives you the most options.
Universal Sprocket Adapter, 8" Wheels - GoPowerSports.com
Split Sprocket #41/420 - GoPowerSports.com
 

Faolan

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So forgetting about the rear sprocket for now, I switched to a 9 tooth front as suggested and gained a lot of acceleration and some to end mph.

Would an 8t give me a little more mph or am I at the point of diminishing return where I’ll loose top speed?

again I really appreciate you kind folks dropping in :) sorry for the dumb questions
 

madprofessor

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There are no dumb questions, Faolan. It's what I call asking the natives.
While a greater gear ratio via a smaller CVT sprocket will allow your motor to rev up more rpms, your governor is going to come into play at some point if you rev it up that high. Means no more top speed from that point. Governor at 4500 rpms?
Wondering how you got to 4500, the factory setting is 3600. We discussed and worked out a proper way for adjusting Predator governors without losing any gas pedal elsewhere on this forum. How did you adjust yours, and are you using a tachometer?
Note: I personally just don't like tiny sprockets because all of the force applied is only shared at once by less than a handful of teeth and chain links. Doesn't mean you shouldn't go to a 8-tooth sprocket, I just personally would not.
 

Bansil

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If link above for 53-tooth is correct, this sprocket with the 60-tooth option should match that (2") bolt circle with a little force (1.965").
🤔.....
:ROFLMAO:

A little force? .035 isn't a little force, that's how you dimple die a sprocket :lolgoku:



Without measuring it, Might be enough to drill out holes to .312 (5/16) or .343


If it locates on the hub, just install bolts loose, tension sprocket by pulling it the way chain will, and tighten 6 bolts, that way sprocket won't rotate since holes are opened up
 

madprofessor

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A little force? .035 isn't a little force, that's how you dimple die a sprocket
I should have been more succinct in how I alluded to "force". The 60-tooth sprocket I linked does say the 6-hole pattern was only "approx. 1.965", and the holes are only 1/4". The 53-tooth sprocket he linked has 3/8" holes, and only 3 of them. So if his existing bolts are 3/8" he'll definitely have to drill out 3 of the 6 holes in a pattern that's already just approx. in size.
Who knows, might drop right in after drilling. If not, a slight wallow of the drillbit will get it done. Any tiny incongruity in symmetry wouldn't even be noticeable on a 9.875" O.D. 60-tooth sprocket.
About that adapter plate, it most definitely calls for a drillbit for its 2.20" pattern, but it's aluminum and wouldn't take much effort. If not drilled/wallowed out ridiculously out of round then again any incongruity wouldn't be noticeable. Could even overlay existing sprocket hub to centerpunch that aluminum and just make 3 brand new holes in a 2.20" pattern if desired. Counting on "the spirit of hotrodding" for folks to find a way to make stuff work, and to make all of it fun and/or rewarding.
 

Bansil

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Lol....just saying, to me 4th and 5th axis machining is daily stuff....to...others just saying drill it bigger is a 😕....I have to buy a drill?

I love this forum because it is 12 year old kids living a dream out of a garage that if they are very lucky dad or mom has tools....opposite is the older farts who know how to set points with a matchbook cover or small paper clip. And can't wait to fire up an English wheel....me? I'm the redneck American that can patch an exhaust leak with an empty Coors can an 2 hose clamps 😜

It's all good.....just gotta keep it diy....Karts :sifone:
 

Faolan

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There are no dumb questions, Faolan. It's what I call asking the natives.
While a greater gear ratio via a smaller CVT sprocket will allow your motor to rev up more rpms, your governor is going to come into play at some point if you rev it up that high. Means no more top speed from that point. Governor at 4500 rpms?
Wondering how you got to 4500, the factory setting is 3600. We discussed and worked out a proper way for adjusting Predator governors without losing any gas pedal elsewhere on this forum. How did you adjust yours, and are you using a tachometer?
Note: I personally just don't like tiny sprockets because all of the force applied is only shared at once by less than a handful of teeth and chain links. Doesn't mean you shouldn't go to a 8-tooth sprocket, I just personally would not.
I do got a tac! My predator has 5 adjustment holes for the spring, I moved it to the last one farthest from the engine and it was at about 4500. I’m hitting 45 with the 9 tooth without hitting the governor

almost fell off earlier opening the throttle too fast, for my weight plus the bike, ~360Lbs it picked that front wheel a good 4 feet off the ground. Very fun! :D
 

madprofessor

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Faolan, how are you set for medical insurance? If it's absolutely important that going faster than 45mph on that thing has to happen, consider your first 45+mph wreck. The importance you put on that speed means that sooner or later you absolutely will push things until you do wreck.
I would ask you to consider the injuries, pain, time stuck homebound, costs, damage, and being away from any help when it happens..................
Murphy's Law: If anything can go wrong, it will. AND at the worst possible moment. AND in the worst possible place. (and if you drop anything when working on a vehicle, it will roll to the exact center under the vehicle. LOL.)
 

Faolan

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Faolan, how are you set for medical insurance? If it's absolutely important that going faster than 45mph on that thing has to happen, consider your first 45+mph wreck. The importance you put on that speed means that sooner or later you absolutely will push things until you do wreck.
I would ask you to consider the injuries, pain, time stuck homebound, costs, damage, and being away from any help when it happens..................
Murphy's Law: If anything can go wrong, it will. AND at the worst possible moment. AND in the worst possible place. (and if you drop anything when working on a vehicle, it will roll to the exact center under the vehicle. LOL.)
Honestly I just wanted to have the option to go faster, I had 50mph set in my head but with the gearing I got on it now 9/53 it’s pretty fun and fast enough :) 10/53 wasn’t cutting it though. Would take forever to get to 40-45 now it’s pretty quick.

yeah I’ve thought about wrecking, not fun. I only wanted the top speed for my short trips down the road. Wanted to go the speed limit (45) so I’m happy. I’m mostly off road going through fields and sand, woods ect and don’t usually go over 30 in those situations.
Thanks for looking out and helping me find a good balance with this setup. You aren’t the first to tell me I don’t need to go 45+ haha!
 

madprofessor

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Don't feel invincible just because there's dirt or grass to fall on. One of my worst bike wrecks was only at about 45mph running a sandy power lines service road. My Yamaha broadsided another one that whipped a doughnut right in front of me. Had to ride sidesaddle for 2 miles to get to some hospital transport, with a football for a gears foot and missing the end of the birdfinger on my clutch hand (now my E.T. Ouuuuch finger).
See what I mean about "in the worst possible place"? One more second and I'd have missed him altogether, so also "at the worst possible moment". Another "worst possible place" was completely out of anyone's sight, facedown in the mud unconscious at the bottom of a retention pond with a ripped ACL and most of my clothes torn off (Suzuki DR650). We can freely choose where to die, but sometimes it ain't up to us.
BTW: That Yamaha was the 1st of my 8 dirt bikes, that Suzuki was the last. Never throwing my leg over another piece of iron as long as I still live.
(The DragginBallz minibike doesn't count as real iron.) You'll learn some lessons too.
By a Graduate with Honors, School of Hard Knocks.
 
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