I`ve just adjusted the gap between header and pipe to 30mm. I think the fuel should be about right now. The engine has pinch at tdc when I remove the plug. You are right about me living far north, about in the middle of Norway, and the daylight is not sufficient for any tach reading yet, of course the dark clouds full of rain doesn`t help either. But we are heading towards lighter days now. I must say that the maglite did the trick though.I was of the impression that the mvvs minipipe was "plug and play" but it seems it must be tuned like a full length tuned pipe after all.