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1988-1991 yz250 motors are completely interchangeable.
Some parts like the cylinder head use the same casting from 1988-1996.
Note: although interchangeable the cylinder ports and cylinder head combustion chamber shape differ form year to year.
The optimum setup for a 1990 yz250 is a 1991 cylinder with a 1992 head.
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∙ 13y ago
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