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1990 cr125 engine

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I have a 1990 cr125. It needs tlc but fixing it up would not be economical. Its easy to swap this engine into my 2003 cr125. The 1990 is the same as the mid '90's engine with the HPP valve. My question is how good is this engine compared to a slightly modded 2003 engine? I like the idea of a six speed vs. the five speed too.

eddie-

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