Originally Posted by Dan Căta
What's the point in reducing the flywheel's weight?
The flywheel and any other moving parts powered by the engine creates parasitic loss. It takes energy to increase the RPM of the flywheel, energy that could be used to accelerate.
I also laced mag rims onto both front and rear wheels, further reducing loss.
And while I never dinoed the engine, the bike was the fastest accelerating street motorcycle (pump gas) for several years in my neck of the woods. I estimate 65 hp at the crankshaft (1960 stock bore and stroke 650 CC Triumph with a splayed head, which I fabricated myself and twin Amal carbs).