I replaced my drive gear in my engine today. Granted the driven sprocket on the rear wheel is worn to saw blade sharp and slightly out of round on the lands of the teeth and makes the chain losen and tighten on every rotation. The new gear in the front was causing the chin to bounce up up up up up down down down down, up up up up etc and so on. I had 2 different bounce rates as the chain went around. Upon inspection of the small gear in the engine, the troughs of the gear had a Damm wobble! I've been successful in riding further than even experienced performance builders. Been at this almost a year. Have been to northeast to northwest Houston. Been to Kingwood and Humble numerous times. Only had to change CDI box last week, clutch cable last year. Replaced that cable with Mazda Miata gas pedal cable. No more of that problem anymore . Yes the cylinder will work in any bicycle brake or clutch handle. May need to file to length depending on your handle. I have also had to change that drive sprocket twice with this being gear 3. But I have the original engine, clutch and bicycle. Ladies and gentlemen, this is a serious science experiment as well as my primary way of transportation. I still wonder if it's a common malady about the gears being pressed offset from center thereby causing a double note wobble. I even tried pressing the top of the chain with a socket with engine running and back tire raised up. It definitely had two bounce rates. And this is guiding the chain left and right of center. This is very very dangerous and I will advise EVERYONE:; PLEASE DON'T TRY THAT AS YOU CAN LOSE A FINGER OR WORSE. The biggest fear I have of these bikes is the drive train locking up the wheel at 31mph. In closing, my engine still running awesome and knock on wood, have been blessed to not have that happen.