Ok, I have an '03 954rr with an ART Pro Series II bolt-on exhaust. Problem is that the bike seems to be running on the rich side. This was with the stock filter and a K&N that I figured would lean things out.

I can of course get a power commander and custom map to correct it, but am I wrong in assuming that something might be out of whack if a bike runs rich with a stock filter and bolt-on canister?

One thing I did notice in taking the can off, is that on the end of the stock mid-pipe, there is a cone shaped piece with holes in it, that slides into the canister.

Has anyone tried cutting that piece off so that it is more straight-through and improves flow? Is there a reason for that tapered end?

I am having trouble finding info on this exhaust. I know it is made in the UK but after half an hour on Google, I am coming up with nothing, which strikes me as odd.

Could this can be causing the bike to run rich, or is there something else to look for? Should I try another can? I was thinking that a Leo Vince or Jardine should work well.

 

back when my bike was new (june 2002) the 2 brothers carbon can directions said to cut that piece off right away. i'm sure it blocks flow but not sure to what extent. cut that puppy off! keith

 

ALrighty, took that puppy off and the bike seems to idle a little bittle and revs a little quicker and smoother. Not a night and day difference, but it seems better. I think it was running a tad rich before, and maybe improving the flow a little bit might have leaned it out a tad.

Still plan on getting a PCIII and a custom map, but it seems to be an improvement already.

Thanks!