I can't find the cause of a miss at low rpm cruising and 1/4 to 1/2 throttle openings. The miss leaves under full throttle. Any suggestions? All the CV boots are good. I put new plugs in.I installed a Factory Pro jet kit and nothing made a difference. I have a Uni foam filter and aftermarket can.

 

can you give more details? Full throttle suggests jets because it's on the main jet. More details please.

 

It wouldn't be the main because the problem goes awaywhen I give it full throttle. Needle changes didn't make a difference. Are there any valves or senloids on the f3 that may affect the jetting? Also what are all the hoses by the air box goingbehind the carbs into some sort of valves?

 

hey poorkid, my bike has the exact same problem. Those hoses are a vacume system which I think the problem might be reading old posts....I am trying to get mine right so I will be following this thread and tell u if I find out

 

First, what year is your bike? Can you describe the problem in full so we don't make foolish suggestions?

 

mine was 1 fouled plug. to check, let the engine Idle and pull off each boot by itsel one at a time. If it misses more put it back but if you pull 1 out and it sounds the same its that plug.

 

I tracked the problem to a fuel issue with carb #1 the pilot jet was plugged and I also eliminated the pairvalve and tubing.

 

FYI the pair valve and tubing is requiredon the F3without it, itwill run like junk and won't hold a steady cruise above 40 mph