Thread: Yamaha WR400F
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Old 07-31-2012, 06:55 AM   #151
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Joined: Dec 2004
Location: Albuquerque, New Mexico
Oddometer: 329
I would imagine since it is two they may have contacted the piston.

I see where you said the piston looked good but can you see any faint marks or gouges on the piston or valves to verify that is what caused it?

Valves can get bent pretty easily when a piston contacts them so
hopefully was not to hard a hit so nothing else got wankered.
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