With only 41cc difference between the 865 and the 904, I wonder whether it would be simpler and better value just replacing the cams with Thunderbike cams? I can't see how you can get that much power increase from only 41cc more?
I know you're getting that performance - but how much is attributable to the cams?
Cheers, Richard
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09 America, Staintune Pipes, K&N, Breathe, Hagon Nitros, AI & O2 removed, tune 20184 (modified), MTX-L a/f gauge
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