Set on a 2 year old Coleman ct200u that has had enough mileage, the rear tire is almost bare. With the stock clutch I was able to go about 23 mph (I'm 205 and my daughter is 35 so the load is about 240 pounds), up to 37 mph! I did not make any other modifications to the bike. Newer ct200u models have a 5/8 countershaft. You will need a 5/8 to 3/4 shaft adapter and an M6x50mm hex bolt from a hardware store. You'll also need to raise the motor about an inch (I used a total of 80 washers, 4 3/4x3" bolts and nuts). All in all I get $110 for a 50% increase in top speed! I'll update when this thing breaks, I finished the install this morning and it's only a 1/2 mile drive before I had to go to work.
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