Alright guys, on the highway running through the gears, the bike seems to pull harder when I do not have full twist.Backing off about 1/8 twistgives hardest pull. The operation of the throttle bodys is flawless and I put in brand new plugs a few miles ago. Any suggestions?

 

what bike is it?

what modifications have been done.... exhaust ... intake ect..

this information will help people diagnose your problem.

 

Sorry meant to include this. Its an 02 F4i. The exhaust has been gutted andI installed an o2 bypass module (salvage bike with a damn cali ECM)but other than that no mods.

 

I would guess its your gutted exhaust. I know if you pull your muffler off completely, they wont run hardly at all upper rpms. I would see if anyone has a stock one you can borrow and I bet your problem is gone.

 

The engine is not tuned to run with no backpressure. Your mixture is probably off. I'm not sure how you could adjust that with a FI bike. Would a power commander be able to adjust that? I just got a bike so I don't know too much about them specifically but I'm just applying what I know about engines in general.

CBRaceRR