Running Lean?

reload · Post by **reload** » Thu Dec 14, 2006 7:43 am

I installed a y-pipe on my 04 rockster the other day and yesterday was my first chance to try it out.I had to go from Kerrville to Fredericksburg, Tx. which is about 20 miles and I was in a hurry so I was running about 80 miles an hour.I stopped to get a redbull on the way back and noticed my header pipes had blued an additional 6 inches or so.That along with a couple of backfires indicates to me the bike is running lean.
Am I on the right track and should I be looking for a power commander or my a Rhine West chip? Any comments will be greatly appreciated.

single650 · Post by **single650** » Thu Dec 14, 2006 7:51 am

The O2 (Lambda) sensor takes care of the mixture and will readjust as required (you did swap it over didn't you?).

The extra blueing is probably due to the faster gas flow through the system as it's now working much more efficiently.

Capt. Blackadder · Post by **Capt. Blackadder** » Thu Dec 14, 2006 11:36 am

Check in your fusebox whether the CCP (Cat Code Plug) is still in place. It's dark yellow in color, and is basically just a connector that tells the Motronic to use a rather lean fuel map which is based on the cat converter being in place. If you remove the CCP, the Motronic will use the slightly richer default map (no cat converter). I'd try this first, and the best part... it's free.

Post by **challey** » Thu Dec 14, 2006 2:27 pm

I installed a Sebring Y-pipe on my R about 18 months ago and left the stock can on. Never really saw any difference in the pipes but the backfires sure became more noticable. Sometime after the install, I de-engergized the Motronic and let it remap, which did some good. Many of the smaller backfires were probably masked by the cat but I still get the occasional loud "blam" (accompanied by some soot getting blown out). Haven't pulled the CCP but plan to try that at some point.
Not sure if there will be any long term harm but most of what I read says not to worry too much. I've probably put about 12K miles on so far with no apparent ill effects.

johno · Post by **johno** » Thu Dec 14, 2006 3:34 pm

The backfire is more than likely the exhaust system not sealing correctly after you have swapped it over.
You need to seal the joints to stop that.
I run a full Remus system, no O2 sensor, a chip, and regularly return 18-19.5 kilometers to the litre of fuel.
Removing the O2 will richen up the system, and wont harm the fuel economy. ( depends on riding style)
Everyone will have different opinions on the O2, and other mods, so I will be interested to see comments.