1) top cylinder. Flat out in 5th gear. HRC card and jet kit just installed and heads shaved 0.05mm. Running older JHA pipes, Daytona filter, reed stuffers, airbox cut open. I obviously was a tad lean, which led to detonation.
2) lower cylinder. Stock head, but the piston ring lost the keeper and the ring popped out into a port. Sad to say, I have seen this happen on 2 other NSR's for no apparent reason.
I lost track after that. Somewhere in there I went to Eric Gorr's overbore for the cylinders that were damaged by seizure. Had a few issues with the Wiseco forged pistons seizing on the overbore, but I believe I have all that ironed out now.
The top 3 things that led to reliability issues for me were
1) HRC jet kit which blanked off the powerjets
2) ignition derestriction combined with shaved head running junk pump fuel
3) incorrectly "reading" the plugs on my plug chops. _________________ Paul Herr
'88 FZR4/GSXR/YZF Frankenbike
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