I have two yamaha tw200, the problem are, when i push the start button the start engine running but it wont kick in and turn the main engine. what can be the problem? the wierd part is when i have an external battery and puts the negative pole on the startengine and the positive pole right in ground on the frame, then its starts the right way.

It looks like your compression is too low (worn rings from dusted motor) Push starting spins the motor faster than kick starting and when hot the rings expand just enough to seal off. Before kicking a cold motor try putting in a squirt or two of engine oil in the plug hole to see if there is a difference.

Starter button. The only problem with that is you'll have to replace the whole combo with the run-stop,starter switches, etc;...

making eeee sound as the motor turning over but no fire, check if you get fuel and spark, two items that will make the any engine run, without it, it wont fire or run. check if you getting sparks, pulling the plugs out and crank the motor and see if any sparks exist, next check if you getting fuel. no sparks can be your coil. hope that help some

hi buddy,

its time to change your clutch kit, here's the best one for your TW200
http://www.starcycle-usa.com/servlet/Detail?no=12114