Help Missing 10 hp at 2KR

Discussion in 'Yamaha 250cc In-Line 4's' started by cornulio81, May 5, 2020.

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  1. DannoXYZ

    DannoXYZ Well-Known Member

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    Before ordering pistons, measure piston-to-bore clearance.
    You may have to use oversize pistons due to wear.

    Cast-iron liners do wear out.
    They most likely need to be honed and cross-hatched before installing new rings.
     
    DannoXYZ, Jul 24, 2020
    #41
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