I've had my 02 f4i fora little over a year now. when i got it, it came with a 2-bros high-mount pipe (no more cat) and pc-III. when i rev it up (~7-8k)and let the engine slow itself down (especially when cold) i hear "pop, pop" and a ~9" flame shoots out of the tailpipe. Is there something wrong with my bike, or is this just a side-effect of the mods?

 

btw it's done this ever since i got the bike (but i bought it used), and i've had no other problems besides this... and the bike still gets ~45mpg

 

Other than the cool factor at night I would say it sounds like you are running rich. May want to check the map that is loaded on your PCIII - or if you really wanted to get it purring, go have it dyno tuned and I'm sure they would fix that problem and also make a fair improvement to the performance.

 

I hear alot of that with people that have PCIII's maybe you just have the wrong map ...other than that I think 9" flames are co0o0o0o0o0l

 

ya, you are running rich, my car used to do that when i would let off the throttle, or downshift....

 

you can also tell that you are rich by looking at the end of your exhause pipe... It will get very black and sootypretty quickly, and you'll find it more of a pain in the **** to clean.

 

keep the flames thats tight!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!![&:]

 

yeah the edge of the tip is charred completely black

i re-loaded the pc3 map tonight. i'll know tomorrow if it worked or not.

 

I have the same thing with my Akrapovic slip-on but no Power Commander

Puts on quite a show though..haha

 

My buddies GSXR 600 with a Yoshi slip-on used to do that too....can't remember if he had the Power Commander or not though

But yeah you're just running rich

Pretty cool to see the flames though