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02 cr 125 motor work

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whats the best way to modify the motor on my 02 cr125? i talked to a local tuner and he said the ports were too big. he did say using epoxy to make them smaller would work though he doesnt have a lot of experience working them. what about different heads like phathead or VHM? also i remember seeing in a magazine that team geico(previously amsoil) had turned it into a long rod motor and also what of strapping on a 97 cylinder?

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If he doesnt have alot of experience with Cr motors, you probably shouldnt listen to him.

Ask somebody else

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sorry i miss quoted. he didnt have a lot of luck getting them better. not that its not for trying

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Eric Gorr's tuning book talks about the 2002 CR125 cylinder have ports that are too large. He recommends a Wiseco 755MO5400 piston for a RM125, which will slightly change port timing in favor of low/mid power. The head will then need to be cut to match the piston.

He also mentions that the cylidner/crankcase has a horrible overlap and needs matching, and I believe the crankcase has too much volume to be ideal, which requires epoxy to fix.

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Eric Gorr's tuning book talks about the 2002 CR125 cylinder have ports that are too large. He recommends a Wiseco 755MO5400 piston for a RM125, which will slightly change port timing in favor of low/mid power. The head will then need to be cut to match the piston.

He also mentions that the cylidner/crankcase has a horrible overlap and needs matching, and I believe the crankcase has too much volume to be ideal, which requires epoxy to fix.

which year piston would that be for?

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