I've got a real head-scratcher of a problem on my Mk2 850.
There is a low rev miss on one cylinder but over 3-4000 revs it clears but when the tank is off and I have a fuel feed direct to the carbs it runs perfectly. Put it back on and the miss is there again, I've tried this a few times to make sure.
It revs through great when opening the throttle. I've changed plug, cap, coil and cleaned/checked carbs.
The only thing that is bypassed by giving a direct fuel feed to the carbs is the fuel pump but as it revs through with when you open the throttle surely that can't be it can it???Anyone here had a similar problem?