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  • Users: jk12r
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  1. jk12r

    modern motorcycle 4 valve head porting

    I have a bmw k1200r and am looking to get the head optimized. I have a spare head and looking at it the casting is pretty good already. Valve angles are tight at 11 and 10 degrees, exhaust and intake. The "short side" radius is nearly straight and flat into the combustion chamber. You can see...

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