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Dirt Bike Mods & Maintenance
piston siezure cause?? w/ pics
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[QUOTE="jar944, post: 993413, member: 65305"] ****i bought it this way**** 2002 yz250 I belive i've found multiple issues that caused the demise of this engine but im not sure which one dealt the death blow. the Previous owner stated that "the crank was going bad (making noise) but we kept riding it it got hot and it quit. i think the rod took out part of the piston" well it still turned over and had *some* compression 90lbs....... the orings in the head were shot and the bottom end was full of coolant....the cylinder plating was worn off around the intake and exhaust ports and now for the pics... siezed intake side <img src="http://img.photobucket.com/albums/v695/jar944/DSC01072.jpg" alt="Image hosted by Photobucket.com"> slight siezure mark on the exh side <img src="http://img.photobucket.com/albums/v695/jar944/DSC01075.jpg" alt="Image hosted by Photobucket.com"> intresting crown....i belive being immersed in antifreeze had something to do with it <img src="http://img.photobucket.com/albums/v695/jar944/DSC01076.jpg" alt="Image hosted by Photobucket.com"> burnt underside <img src="http://img.photobucket.com/albums/v695/jar944/DSC01077.jpg" alt="Image hosted by Photobucket.com"> so i think it was running to lean.... the cyl was worn beyond spec... the orings in the head failed and allowed coolent into the cyl and maybe it was run on straight gas oh and the crank and main bearings seem to still be within spec (i have no idea why) anyone have any different thoughts as to what killed it?? [/QUOTE]
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piston siezure cause?? w/ pics
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