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« on: August 21, 2021, 09:36:47 am »
I can't speak for individual organizations or insurance companies, but if you alter the engine in a way that removes the governor's stock max RPM limiting function, the safest plan for both yourself and other racers around you is to switch to a flywheel that is designed for racing.
I have been on the track when a competitor's stock flywheel came apart right in front of me. His chain broke and the engine immediately accelerated to destruction. This was a Yamaha "F200" engine where the base engine was either made by Yamaha for Kohler, or for Kohler by Yamaha. Our "racing" max RPM target was about 6k rpm but that was exceeded quickly when the chain broke. That is when billet became the rule in that class. Almost every single time a rule has been made to mandate billet flywheels when a stock flywheel used to be allowed, it was because of an on track/dyno/rev-stand failure that far too often resulted in injury.
Heymow does not advocate the use of a stock flywheel in an instance where the governor on the engine has been removed. If the governor is removed, an SFI certified billet flywheel should be used. I'm not going to entertain an argument or "what if" scenarios about this. I don't want to hear "So and so organization allows..." because I don't make or influence someone else's rules. Seriously, don't test me. I don't have time for it.