CO Pot

[SmokinRZ]

Hello, 

 

I recently discovered my US spec 98 GS has a CO Pot along with a pink CCP and a O2 sensor.  The bike runs great but seems to run rich and leaves carbon on the rack brace that runs several inches behind the exhaust tip.  I'm tempted to remove it and see how it runs.  My limited research says this only affects idle mixture.  In contrasts, I had a second 99 GS that lean surged and the exhaust popped when cold.  No CO Pot and the same pink CCP.  

 

I'm just curious what the latest consensus is regarding the CO Pot.  Turn it in one turn at a time and ride a few days each turn until it runs worse and then back out a turn?  Find someone with an exhaust analyzer and adjust it that way? Just remove it and see how it performs without it?  Obviously, the previous owner or dealer thought it was necessary but now that I'm sitting here thinking about it, I want to find out for myself if it is necessary.  Thoughts?               

[roger 04 rt]

The CO Pot has no effect with a Pink Coding Plug and O2 sensor installed. It (the CO Pot) only functions with no plug or a beige plug. 

[dirtrider]

11 hours ago, SmokinRZ said:

Hello, 

 

I recently discovered my US spec 98 GS has a CO Pot along with a pink CCP and a O2 sensor.  The bike runs great but seems to run rich and leaves carbon on the rack brace that runs several inches behind the exhaust tip.  I'm tempted to remove it and see how it runs.  My limited research says this only affects idle mixture.  In contrasts, I had a second 99 GS that lean surged and the exhaust popped when cold.  No CO Pot and the same pink CCP.  

 

I'm just curious what the latest consensus is regarding the CO Pot.  Turn it in one turn at a time and ride a few days each turn until it runs worse and then back out a turn?  Find someone with an exhaust analyzer and adjust it that way? Just remove it and see how it performs without it?  Obviously, the previous owner or dealer thought it was necessary but now that I'm sitting here thinking about it, I want to find out for myself if it is necessary.  Thoughts?               

Morning  SmokinRZ

 

As Roger mentioned with pink CCP it looks to the o2 sensor for guidance not the CO pot.

 

BUT, you could have a problem with your  o2 sensor so you might completely remove the CCP, then set your CO pot to mid range (turn screw all the way in then count the turns to all the way out, then screw it back in 1/2 way. (this is a good starting point). Ride it in this position for a few days to get a base line.

 

Then try riding the bike for a few days with the screw turned IN an additional 2 turns (evaluate engine low speed operation & curb idle operation).

 

Then try riding the bike for a few days with the screw turned OUT an additional 2 turns (evaluate engine low speed operation & curb idle operation).

 

Once you know what  direction you need to be in from center then  do 1/2 turn tweaks from there until you feel it is best.

 

Just keep in mind that as you lean out the idle with the CO pot the hot engine curb idle RPM will usually become lower.  (you might have to tweak the BBS screws to compensate)

 

Also keep in mind that a lot of times that black soot at exhaust outlet is from burning a bit of oil. (especially if you park the bike on the side stand)

 

 

[SmokinRZ]

Per Dirtyrider's description, I tried to  bottom the Co pot adjustment screw and it would not bottom or  top out.  It has a bosh part number so I wasn't sure what to think, so I just removed it.  Actually, I removed it to get an accurate baseline while adjusting it.  Just for reference, this is the little squarish device that sits in the pocket of the rear fender on the right side and has one brass flat blade adjustment  screw and just clips into the harness with a wire clip.  I went for a short ride and everything seems normal.  If anything changes after a few rides I will report back. 

 

Thanks,

Smokin