Reving beyond 8000 RPM

Given the "flexible" crank, is rpm increase the only way to go for more power? Perhaps street riders would be better off just increasing the engine size and
have more enjoyable bike at the same time?

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Yes only livable way to get more out of Norton Twins is force more mix in per
swallow, either by bigger carb and better port, Up CR or by boost and/or special fuels. Then the drive train begins to dissolve. Maney limits his 920 89 mm stroke race engines to 7200 making right at 100 shaft hp.

Ms Peel goal is street able off road bike pumping up the torque side of hp equation so hunt down sports bikes and live to tell.