Originally Posted by def
Boy, did I ever! After reducing the flywheel weight, blueprinting the engine, balancing, cleaning up the intake ports, installing Witham valve springs and adding RCMs, that 650 CC Triumph engine would turn ~10,000 RPM and made lots of HP above 4200 RPM.
The sounds of a vertical twin on song at 6000RPM and above gave me goosebumps!
What's the point in reducing the flywheel's weight? I knew that this only helps if you rew the engine while standing, and that while riding, the whole clutch+gearbox+shaft+rear wheel weight would not influence the flywheel, since it's so small compared to the other parts.