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Discussion Starter · #1 ·
yesterday my bike wouldn't start and had very little compression, when i tore the motor down i found a bent valve (the smaller one) and small indent on the piston where it had hit the valve. any ideas as to what caused this? and to how i can stop it happening again as i have just ordered a trail bikes big valve head kit with domed piston ect and i dont want that to go the same way :cry: . the valves were gaped correctly and the spec of the motor was, standard head, kitico 88 kit with 20mm carb, kitico cam, kitico rev box, sano exhaust and tb manual clutch, running on sunoco race gas.

do the aftermarket rev boxes have any upper limiter? or could this have been the cause of the damage.

pics below but its hard to see the damage

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