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Dirt Bike Brands - Other
WR/YZ 426F Weirdness...Help?
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[QUOTE="SFO, post: 107210, member: 21864"] I wouldn't say that the small end was wasted, it is showing signs of galling. The wrist pin took the brunt of the ugliness and is exhibiting a torn up surface finish. The squish I measured before pulling the cylinder off was .030"-.055" below the deck of the cylinder without a gasket. The edge of the cutout for the center valve was shiny, not the base of it. I have run some tight set-ups before that left this area with a circle in the carbon. When I put the larger piston in you know I am going to clay it. It seems like the piston needed a larger diameter relief pocketon the center valve. Is there a history with small end issues in this motor? I will be charting the head at Kibblewhite this wk, I will report on the state of the guides and keeper grooves. Rich, you should be getting my cams this week for the Ti comparison. I guess I feel a little ruffled when I take my new bike apart and find issues. Thanks for the time, Bill. [/QUOTE]
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Dirt Bike Brands - Other
WR/YZ 426F Weirdness...Help?
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