Running Problem S4R

[small boy]

Hi,i have a running problem on my S4R,between 3-5000 rpm,there is a misfire/feels like it cuts out for a moment,rev counter seems to falter slighty any ideas ?
Cheers
Smallboy :)

[farl]

Mine does that too Smallboy. I've ordered the cat replacement from spareshack. Hope that might get rid of it. Makes filtering tricky doesn't it!?

[small boy]

Hi,i have the spareshack pipe and still the problem arises,pipe makes a big diffence tho,nice one. :)

[LAURENT]

Same problem but no solution

Laurent