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mainly relating to performance.... buddy of mine said they were the same engines but i thought that i had read that there were several differences. ran with a 99 cr the other day and it seemed like it just sounded different? i know there is a good bit of power to weight diff. figured thats why it sounded like it revved so high?
The CR engine does Rev easier, specially easier than the Long Rod 87-89 TRX250R engines. The CR250R IGN also has a much lighter Flywheel and again Revs Easier & Higher...lot's of differences between a TRX/ATC250R & CR250R engines...CB, Stroke (short verses long), Cylinder Porting, Head/Dome, Piston, Cases, Interanls, ect...

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