1. Hello to all who read this! i have a coleman ct200u ex and i installed the torque converter from gopowersports.com and also removed the governor screw, bike rides great now but when i change the sprocket size in the front from 10 to 12 for more speed the motor rattles and vibrates real bad causing me to turn it off and walk it home. i have the stock 50 tooth rear sprocket and #420 chain. what combination of sprocket and chain do i need to get me to go faster? all info will be greatly appreciated.

    1. Hey Alex! It is possible that maybe you didn’t bolt the engine properly after the changes you made which are causing the vibrations so check that first. You can also change the spring in the driver clutch of the torque converter to a stiffer spring so that your bike doesn’t lose low-end torque since you have changed the gearing.

  2. I got my Coleman BT 200 BX up to 30mph just but hacksawing off that welded throttle screw, did nothing else. ( I weigh 205 pounds). plenty of speed and power now !!

    1. I have a Colman CT200U, 196cc, and removed throttle stop screw,adj.spring on governor arm that attaches to motor,relocated it to the 3rd. Hole closer to the outside of the arm , had to slightly remove gas tank to do this. Drilled 2 3/8 size holes in backside of filter airbox to increase air flow to carb. Also measured throttle return spring and cut 1/4 inch off, then stretched back to original length and reinstalled, works perfectly, then just installed exhaust header and a rear 40 tooth rear sprocket, running original jack shaft setup, it works perfectly and still will raise the front wheel of the ground, Top Speed, just did test run 35 mph, very impressed and still has plenty of torque at take off, and still good on hill climes, all of that and only spent 64 dollars, on parts, trust me .Those adj. Are Safe all original parts in place, max rpm around 4000, governor still in place. Enjoy!!!!

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