Join Date: May 2004
Location: Toronto, Canada
200 horsepower normally aspirated is a mighty lofty goal when starting from a production engine if you are going to stay (near) stock displacement and redline.
If you stick with stock redline you'll have to make 81 lb.ft of torque at 13,000 rpm redline in order to do it. 80 lb.ft of torque per litre of displacement is pushing the limits of what's normally possible using pump gasoline fuel and no forced induction or chemical trickery.
MotoGP bikes are pushing 220 horsepower or thereabouts (exact details are not available) but they're revving to somewhere near 16,000 rpm. If peak power occurs at redline, that's 72 lb.ft of torque at 16,000 rpm. Peak torque will be more than that at somewhat lower revs. Those engines have nothing to do with production engines ...
AMA or World Superbikes are more like 180 horsepower. That requires 72 lb.ft at 13,000 rpm - that's still a big increase over stock, but it's within the realm of possibility.
You'll need not only cams, but also whatever it's gonna take to make the bottom end survive it ...
Helibars, MRA screen, Ohlins damper, reversed shift pattern, sorted suspension, braided lines, Michelin Pilot Power, all else stock 'coz it's fast enough!