I have a PVL flywheel to install on a Ducar 196. Should I lap it to the crank or can I just install it and be good. Engine specs are, no governor, stock cam, weenie pipe with muffler, open air filter and carb jetted. Going on a Barstool so not much chance of sustained full throttle. Do I need to change the valve springs? If so what do I need for the stock cam? As always, thanks guys.