what year engine is this and how many miles on the engine and clutch. Also where did the crank get rebuilt and was it a complete rebuild with all new bearings. Is the wide bearing kit installed. Is the motor oil injected or premix.
Still need more info on this engine. How many miles on it other than 100 on the crank. How long have you owned it, is it based on a 700 or 800 bottom end. is it set up for high altitude mountain riding..
Does it run on pump fuel or something else like av. The more info you can provide the better.