[john bigonion]

I don't know if they fit, but I do know a company that can lighten and balance a flywheel. KMS engine development. Go to hondaracingstores.com They charge around 125 and they say they can get the weight down to 10lbs.

 

[john bigonion]

the weight of the flywheel gives the engine inertia, it makes a manual trans easy to shift. The flywheel is actually a cheap and simple way to store energy, rotating energy. the engine will rev faster but will also wind down faster also which will make daily driving more fun or challenging.