bought a used f4i ran good, replaced cct with a manual one.. still ran fine replaced stock exhaust with scorpion slip on and shortly after started bogging down in lower rpms in first and second. also bogs at cruising speed on interstate say around 7g rpms.
did some research and found the clean air mod, and tip off mod, did both of these, while i was there replaced spark plugs with new ngk iridioum(sp) plugs and k&n air filter hoping it would fix are help bog, but did not almost seems worse now at low rpm's.. any ideas? any help would b great!!!
btw i am also starting stunting, basics (wheelies, stoppies...) idk if thatll make a diff.

THANKS!!

 

Is the map sensor plugged into the wire harness and have the vacuum line running to it?

 

Yes it's plugged in and it's vacuum hose is hooked up to it

 

with a aftermarket pipe and a k/n filter you you need to get a power programmer to fix the fuel curve....

the bike thinks it is still stock, and is not compensating for the increase in air flow

 

ok, ill try that next.. but wen i'm idling at a stand still it smells very rich! and when i take off it bogs HARD almost to die, like its flooding itself.. does it still sound like its the fuel curve, and the bike not adjusting itself?

 

Yes..

 

my f4i runs like a raped ape with a K&N filter and NO muffler.. Sure it loses a low end torque, but I never experience a bog

something has to be wrong.. Maybe its the fuel pressure regulator?

I'm not a expert though so its hard to say.. If you want to make sure its not a overly lean problem, tape off one of hte air box holes, and tape the other like half over

But I think there is something else wrong

 

I can floor my bike from idle, and not have any bog... So something is definitely wrong

 

Thanks for the ideas and help guys, FPR was bad dumping fuel into the #2 &#3 cylinders. 75 bucks and gonna be back on the road tomorow