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Have I made a big mistake??? Have I made a big mistake???
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 4 Jan 2009
Tenere Tom's Avatar
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Have I made a big mistake???
I have recently completed another XT600 engine re-build.

It's an early kicker engine with decompressor.
I thought I'd do a 'special' as I've built a few 'standard' engines without problems.

A basic run down of the spec is:-

Standard bottom end with Carrillo rod
Standard bore cylinder
High compression piston
Gas flowed head

All this may seem OK - but I think there might be a small conflict.
High compression piston + decomression lever = bent valve

Has anyone done this before?
I am dreading stripping it down as the valves were flowed aswell and won't be cheap to replace.
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