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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
nasty looking piston 2003 rm 85
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[QUOTE="rmrider45, post: 1347890, member: 96571"] my son raced his rm85 in a harescramble last weekend and the bike ran fine . i rebuilt the top end a week before the race .just this saturday he was on the track and the bike just died .i got home and took off the cyclinder and never seen this type of damage. the top of the piston had lots of pits in it and whatever got in there went on the side near the ring and made the ring fail. the only thing i did after the rebuild was change the plug on race day. could a small stone fell in the plug hole when i changed the plug?i have rebuild this top end on this bike many times and have never seen this.strange thing is the cyclinder wall is perfect only damage was on the heaD (small pits) and the top of the piston has anyone had this happen to them? thx here are some pics [img]http://i39.photobucket.com/albums/e154/ozzymary/top.jpg[/img] [img]http://i39.photobucket.com/albums/e154/ozzymary/side.jpg[/img] [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
nasty looking piston 2003 rm 85
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