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I am working on a similar project on a much smaller scale. A single cyl engine of roughly 13 cu in displacement - approxemately 2.6X2.5 bore and stroke - puts out about 5HP at 3600 Rpm and I want it to run closer to from 600 RPM to 2200 maximum.
From my research valve timing will be critical - particularly closing the exhaust valve early to trap compression pressure. I am being told advancing the cam one tooth is too much - the engine will "fall on it's face" at about 2000 RPM. Guess what? That would not be a problem for me!!. Have not tried it yet but looking forward to trying it soon. If it doesn't work I will aquire a spare cam and try modifying it - - twisting? possibly to advance only the intake about 4 or 5 camshaft degrees (8 to 10 crank) without changing the exhaust - Narrow the lobe center angle - and hope the overlap foesn't kill it - - -
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