Try this excellent book for more info: A. Graham Bells Performance Tuning in Theory and Practice. .
For some accurate calculations, try Larry Meaux's Pipe Max.
His program is excellent and will provide a lot of info.
Pipe Max
Piston weight in grams includes: Piston Piston Pin Rings Pin Retainers
With this calculator, you can see the effect of what a different rod length will have on the rotating inertia of your engine. Compare what the results are with your rod length then use a different rod length to see what the new numbers are. You can also see what the results would be with a different stroke.
