The actual act of balancing is not that complicated. Do a search on engine balancing on the net and you will find lots of info. The big trick (especially with a single cylinder engine) is picking the correct balance factor for your use. The balance factor is the amount of piston and connecting rod weight balanced out by the crankshaft counterweight, usually expressed as a percentage. The problem is that the balance factor changes according to the rpm range and and useage the engine will see. Essentially, you can only be really smooth in one rpm range and the rest will be worse (sometimes a LOT worse). This means you must set a compromise to get the best overall running, balancing high rpm smothness against low rpm roughness. It can be a can of worms and very tricky to sort out.


Mark