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1990 cr power valvesThis is a discussion on 1990 cr power valves within the 2-Stroke Motorcycles - General Discussion forum, part of the 2-Stroke Motorcycle Forums category; hi im new here, and i was wondering if any of you guys know about power valve clearances. i recently ... |
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#1
04-13-2009, 06:13 PM
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 1990 cr power valves hi im new here, and i was wondering if any of you guys know about power valve clearances. i recently destroyed my piston and cylinder wall and so i got it bored out to 67.5 mm. my question is how far to grind the valves and sliders. i dont know if they need to be ground completely flush to the cylinder wall or slightly recessed. im asking because i have heard of pistons expanding when they get hot and i dont know if the valves do that too. any help would be nice, thanks  |
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