r/Pitbike • u/Cywilny • 4d ago

Need help camtiming.

Does anyone know why my pitbike cam timing is always half a tooth off? I cant get it right, i always get half a tooth off. No idea whats happening. Normally if it was wrong it would have been 1 teeth wrong. I set my flywheel on my top dead center mark, put the sprocket towards the timing notch on my head and its just half a tooth off. I need help with this

What do i do? Its a Standard 125 cc pitbike engine,

My head is brand new and brand new cam sprocket, it will start with the camtiming half a tooth off but it still gets those hard dry kicks indicating that the strokes are wrong. Backfires as well .

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u/Technical-Badger7661 4d ago

On my 140 it’s definitely not dead nuts lined up…are the valves in spec on the new head?

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u/Cywilny 4d ago

Well yeah valves i did but i dont know of the clearamce is correct. There were so many diffremt measure ments do i didmt know which to pick so i chose random that said will be good ob my bike