I'll keep it short.
Symptoms: Won't hold Idle very well, Very snappy/grabby/jerky throttle, Starts very quiete and after a few seconds it revs up past idle then back down to idle. (already checked the vacuum line)


Running at about 4k rpm's. When I tap the brake the bike slows down and takes awhile to pull itself back to Idle speed. Especially if I'm going slow, forget about relying on idle to bring the wheelie back up. What's wierd is how snappy it is when I blip the throttle. I'll try to roll on the gas and the thing jumps forward. I stunted 2 other F4i's this weekend and they ran good so I know somethings up.

My thoughts: Plugs, Throttle body, fuel filter, ECU. OR When the bike was stock someone put a racing clutch in it or some mod that's making it hard to stunt??? Motor was new to me last year when I was still learning basics but now slowing it down I'm noticing a problem. Need more Idle power!!

Any advice before I start tearing into this thing?


Geared- 64t rear, stock front

 

I'm having the same issue with my 01 f4i. did you ever figure this out cause I'm trying to learn circles and this issue is pretty much killing my progress

 

try changing out plugs and wires... and check the idle screw thats under the air box

 

Plugs are brand new, but still having this issue the bike won't hold idle once i turn it up from the 2nd idle screw i added, once i turn the idle up to around 3500 it'll stay there for a minute but soon after the bike returns to stock idle around 1500 and won't pull for ****, and if I'm slowing it down to circle it mouse traps me every time... PLEASE HELP?? do i need to try a different set of throttle bodies???