Ok heres the deal, laurens 03 f4i ain''t runnin right. at the bottom of first gear it totally falls on its face. I can twist the throttlewide open and nothin, just bogs. then once it hits round 2500 it picks up and runs normal. Not as horrible if shees riding by herself, but once we r both on there its just horrible, this thing can''t get outta its own way pullin out from an intersection n ****.

Now heres the thing we tried already, New plugs, fuel tank flushed and clean''d n ****, fuel pump checked, and computer swapped.

Now i''m in a pretty good situation, cuz i have my f4i stunt bike that runs perfect, so i have a perfectly runnin bike to swap parts for troubleshooting purposes.So if u have any ideas AT ALL please let me know what you are thinking, any help would be greatly appreciated!


Thank you very much!!!

James

www.Clutchitup.com

 

Do you remember what the plugs looked like before you replaced them?

Fouled? Wet? etc. And did they all look the same, or were a couple different then the others?

 

Yeah im having a similar problem.

vacuum lines. Check the #1 and #4 that go into the airbox. They should go into the airbox which justs plugs the hoses. If ones off its deff the problem. One thing i havent checked on mine is the fuel regulator on the throttle bodies. I heard they can go bad but im not sure how to diagnosis it.