Hi All
I have a 400i auto, was out riding and started to act up.
These would happen on and off. Give it the gas and seem to not have power. and after going at high speed and let off the gas would back fire numerous times then quit, hit the start and away it went. Like I said this only happened some times other times it kicked butox [img]i/expressions/face-icon-small-happy.gif[/img]
Any help would be great

 

Update,

I have changed the plug in it and went for a ride. Was doing the same so I pulled the plug found it was black. Keep in mined that I have put in a K&N and did the muffler mod befare all these problems. Seems to have started after the K&N went in as the muf mod was the 1st this I did. Now I do know I have a main jet of 150 in it. do I need to change the jet or is there an ajustment on the carb,

Any help would be great thanks