Re: Polini 4.2 air cooled parts?
Well if its 15 yrs old and you have a Polini engine its probably a 910 Polini Carena, and I have one. The engine and frame should have Polini markings cast into the parts all over. Does it have 5" or 6.5" rims?? There is also a 911 too.
Sound like you need a new crankshaft, $200 plus dollars, unless you find a shop to split the crank and put a new bearing. I use to get parts at midsouthminimoto.com, from Stoney, don't think he is in business anymore, but you can look at parts for your bike there. Not sure if Polini USA is still here also.
Empty Pockets Racing: The difficult we do, the impossible takes longer.....