That SUCKS. What was the outside temp? I had a similar insident only mine happen in sixth and locked the rear wheel. Mine was a jetting mistake and I got away with a hone and piston. You can't run it without a thrust washer though.
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike