i have had it pointed out to me by an engine builder that you can go too light on flywheels and things like wild cams and road use need to be taken into consideration.
the flywheels job is to keep the cranks initia constent to reduce stress on engine and gearbox components.
also pointed out never to thin a cast type flywheel more than a 1/3 after this a steel one needs to be made
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