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250 big bore kit

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With a big bore you will not need to change the carb or the reeds or anything else. And with a 265 kit, you may not even have to mess with the jetting.

Costs will vary but if you went with Eric Gorr (the owner of Forward Motion) he can turn your RM into a 265cc for about $550 which includes porting. Now, 265cc may not sound like much but it will be noticable plus the added performance of porting (go for the broader powerband porting), you will have the power of a newer RM.

Word of caution, do not try to email Eric ~ he gets too many emails and never answers them. Either call or just send him your cylinder and head. If you included the sheet that's on his web site he will know what to do.

http://www.eric-gorr.com/index.html

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zig does eric do 300 kits?

Yes, he does 300 kits, but he doesn't list one for an '89 RM250. He might have one but just doesn't have it listed.

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