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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
1990 RM 250 maintanence
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[QUOTE="extrememoto, post: 701988, member: 47711"] Have a local shop do a compression test and that will tell you the true condition of the ring, but if it was my bike put a vertex piston in it. Suzuki 250's runs a 2 ring since 1995. Do you hear a rattle, common in 1990-1993 when the piston/rings were worn? Kick it over and you should have some resistance, if not replace it. A 2 stroke almost always smokes when started until it is warmed up, but if it is WHITE smoke, you have a problem. It will also have a smell of antifreeze if you are blowing white smoke, and it doesn't go away after it is warmed up. Ask a local pro at the track and he can tell you immediately by seeing it. Back in 1991, we added a extra base gasket and had a performance shop mill the head to compensate for the extra gasket and it will plain rip. This changes the port "timing". In 1996 yamaha offered in its Yamaha YZ Wrench Report and recommended racers to do this, although it was offered as a kit. This will do the same thing for the Suzuki of the 1990 vintage. It will give it a sweet pull throughout the range...invest in eric gorrs book...enough said... [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
1990 RM 250 maintanence
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