A compression test or pulling off the pipes and peeking in the exhaust ports should tell you all you need to know.300 is prime though set up can be tricky if you set to kill, but its worth it!!
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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