Iv'e had 2 tysf 125's put a big bore kit on both 150cc lol not that it needed it just wanted to pull 2 nd gear better,i'm 16stone and had np's with them both.
I know it sounds daft but have you checked state of your pads.i had same problem kept backing off adjuster cos they kept sticking on,checked pads mine were down to the metal replaced now no problem
The Rev 3 200 is soft also the 250,should have tried a 270 bit sharper than the 250. if possible,machine the flywheel will make it pick up a lot quicker depending how much you take off,go too far and suffer no bottom end grunt.i once bought a sy250 because they were supposed to be docile.got it home went out to try it.Thought i was on a motorcross bike just a touch of throttle and it was off like a rocket.checked timing to see if it had been altered,but no.Happened to see a Scorpa 250 flywheel for sale on e bay.didn't look the same as my one.rechecked mine that's when i noticed it had been machined down.
I trimmed mine down as per pic made it a lot more flexible and bent it slightly with hot air gun and,held it on at the rear with cable ties rather than the bolts.because i have a habit of coming off.
rev3 coil resistance values.
in Beta
Posted
This is from EVO Manual