Fontyyy's MC28 is effectively SP250 spec. If you looked in a 1994 HRC SP/SS manual, he's just done exactly what Japanese SP regs allowed and Honda says to do, less some clean-up work around the ports/cases, and it works. (The porting and cases had to stay stock for SP250.)

I would expect a simple "cleaning up" of the internals in the right places (and within SP rules) could easily see another couple hp @ peak and a couple hundred rpm over-rev to his MC28 without any losses.
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Andy.
NSR-WORLD.COM

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