Hey all maybe its time to strike on this taboo subject?
my gp3 is fairly smooth compared to my last cag and revs extremely fast as it has quite a thin and lightweight crankshaft. unfortunately it came from the factory with the two lobes offset about 2mm which i have just fixed.
but i thought with everything apart i should have a go at balancing it some so i put the whole assembly together and stuck it all in the lathe between a pair of live centers.
as youd assume the piston always comes to rest at the bottom. but by sticking an M10 nut on the flywheel adjacent the crank pin i can cause the setup to rest at any position! the weight of the nut is somewhere between 10-30g.
my question to the geniuses out there is this. is this setup balanced now it can rest in any position! And if it is done - should i add weights to the opposite end or drill out weight from the pin side? i would prefer to remove the material personally.
im aware also that you can never perfectly balance a single piston setup but never the less im sure it can be better than what it was.
im kicking myself i never tested the setup from the dreambike with the stuffed polini crank thats balanced. bugger.
