Lightened fly wheels (irk) aren't worth it. And on a start in neutral only bike (clutch on the crank) I have seen them destroy the clutch into thousands of pieces and also destroy the clutch case.i've got a lighter flywheel laying around on another engine i bought for pieces.
is a lighter flywheel better or worse for overall performance on these engines.
this thumpstar 125 has significantly more power/torque than my other lifan 125 engine...
too bad that other engine's too much damaged, con rod bent, cilinderhead prettymuch destroyed from a broken off valve. it's a yx 140, rest of the bottom end should be fine.
i might get a yx 160 of all else is upto spec (suspension-wise)
Excellent. Also the lever with a hook either end that pushes the star gear can need removing and with a small round file make the hooks a tad sharper as sometimes the ends go blunt and don't push the star pins enough.all good now, worked the shift star myself,shifts nicely now, just a lil' harder to find neutral because of what i did with that shift star.
one notch was too steep to go from 1st to neutral ,so i rounded that one off a bit to meke it less steep, so less pressure was needed to shift up from 1st to neutral.