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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
piston problems
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[QUOTE="steveva, post: 894657, member: 56676"] I have a 97 cr250 that I just put a new top end in.. I replaced the piston with a wiseco piston kit.. the install went fine.. I went to break it in and that went fine as well.. after riding it for 30 minutes it started running "funny" So I checked everything out and found that the boot in between the carb and the intake had slipped allowing a substanial airleak.. there also appeared to be some dirt around the opening so I stopped riding and took it apart.. I found just looking through the intake at the piston 2 scratches on the piston, these were big enough to catch my fingernail in.. my question is as lean as it may have been running could I have done damage to the piston in that short of a time, and also what (besides dirt) could have caused the scratches?? My friend said something about diffrent size pistons A,B,C,D.. I ordered the piston kit from a big online company and they didn't give a choice excpet for the standard size.. thanks for any help or suggestions [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
piston problems
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