1990 RM250 porting?

ETS

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Apr 13, 2000
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#1
I have an excellent condition RM250 that I'm playing with on single track trails. I have had eric gorr port my 01' rm250 that I ran in the woods and it was great. Now that he doesn't port I was wondering if I should try to port it like the original off-road handbook said. Cut 1mm off cyl and then alter the ports in the cyl. My bike has a cast iron sleeve installed years ago so I was going to bore it the first overbore. Just curious if any of you with the original book like the idea. Just not positive on the rear transfer ports that need to be widened 6mm with epoxy. I have the proper devcon epoxy to do the job. Just wondered if anyone on here has done it or has any pics that would be of help. Thanks, Brad