Originally Posted by Venice Motor Bikes
Higher RPMs are achieved the same way as in any race car... Large ports for more air flow!
Actually Venice, that is pretty much how I got more rpm initially. I opened up the port windows in the cylinder, but it's not as simple as that. I didn't open up the ports themselves. I have seen a huge number of engines ruined by amature "porters" hogging out the ports. I used base gaskets to alter port timing and a hill and GPS speedo to test.
Steven, do one slight mod at a time, test it, then increase it if it worked.
Otherwise you will never know what works or what made it worse.
It is the scientific method they taught us back in highschool. It works.
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