Since I've had this bike I hear a clunk upon accel, and when I did the loctite fixes I noticed a small play between the counterbalancer gear and the primary gear that drives it. Upon rotating the engine by hand I'd hear something very similar to that clunk when the counterweight went past the top and fell back. The pin is fine, it's really one gear clunking against another. So I'm thinking maybe it's those springs that are making this clunking stronger , what if I swapped the gear for an E model gear, that doesn't have any springs (parts nº 3 below) ??