So they all run lean from the factory?

[Moto Fugazzi]

Not mine, so don't assume that they all run lean. Here's the details:

I picked up a 2004 V11 Cafe Sport a short while back. I ran some Techron FI cleaner as the bike had been sitting for a bit with old fuel in it. I also reset the TPS, balanced TB's, and set idle. I also checked CO, which was set at 0, and I noticed that all of the factory yellow markings were untouched.

After the FI cleaner, and installing a working odometer, my first tank of fuel was 31MPG. I decided it was time to add an AFR gauge and see how the bike was running, as the spark plugs were also black. After warming up the bike, I had a 12.5 AFR (at idle) which converts to about a 5.1 CO. The majority of AFR during regular riding was in the low to mid 12's, which would explain the 31MPG.
Guzzi calls for a factory setting of 2.0 CO, and my dealer prefers 4.0

Using Guzzidiag, I set idle AFR to 13.1 (which is approx 3.5 on a CO meter, and an ECU reading of -10). I'm now getting AFR readings between 12.9-13.4 for the most part. at approx 3k RPM's, there's a spike at just over 14.0 CO, which would account for all of the "stumbles" that others have complained about (my 2001 V11S also has the same 3K "spike"). MPG on my last tank was 36, and the bike still pulls strong and runs perfectly.

I can only assume that the dealer didn't set up the bike as all of the factory markings were untouched. The addition of a Stucchi crossover and Mistral exhaust should make the bike run leaner. Based on this and info from the PO, the bike came from the factory running rich. I could be way off with this, as much could've happened to the bike since purchased new in 2006.

I think the most important lesson here is check and adjust your CO after setting TPS and balancing TB's. It's even in Guzziology as being a very important part of a tune up.
Ken 

[Vasco DG]

If the bike has an O2 sensor and it's input isn't turned off then changing the CO trim will achieve nothing.

If it is a pre RC controller then there isn he potential to change the trim value, each *point* adding or subtracting a microsecond of injection time to the pulse width.

Most important is correct physical set up. Without that you can arse about until the cows come home and it'll still run like a bandy-legged emu!

Pete

[Rough Edge racing]

 The A/F ratios given above sound rich not lean. Full throttle A/F for most any engine is around 12-12.5 and part throttle is at or above 14.7...

[Moto Fugazzi]

The A/F ratios given above sound rich not lean. Full throttle A/F for most any engine is around 12-12.5 and part throttle is at or above 14.7...

Yes, this bike (with 15M ECU) was running rich, but people assume that everything runs lean from the factory. As Pete said, a proper physical setup is most critical.

The lambda can be turned off on my 2009 V7C (15RC ECU). The downside is that MPG drops about 6-7MPG to the low 40's. Too much fuel can be just as bad as too little.
Ken

[Kev m]

In other words, the title to the thread was sarcastic...

[normzone]

Interesting...I've never chickend adjusted anything.

[Moto Fugazzi]

In other words, the title to the thread was sarcastic...

Perhaps sarcastic, but more so to make people aware that not all bikes run lean from the factory. Don't put band aids on your bike thinking it needs it. Like that Fat Duc I sent to you, and the guy you passed that on to. Or Pete's customer that with that gadget which ended up adding way too much fuel and trashing the engine.
Ken

[Kev m]

Perhaps sarcastic, but more so to make people aware that not all bikes run lean from the factory. Don't put band aids on your bike thinking it needs it. Like that Fat Duc I sent to you, and the guy you passed that on to. Or Pete's customer that with that gadget which ended up adding way too much fuel and trashing the engine.
Ken

You're preaching to the choir...   

I also don't necessarily believe that running at or near stoichiometric is a bad thing... depends on your goals.

[Kev m]

  :1:
 Uh fellas , I am slow on the uptake , and Ken's thread title made sense to me  WAY too many literallists here  (Yeah , it isn't a word , so...)

  Dusty

I betcha a lot of people that Ken was trying to inform would be so confused by his post that they wouldn't have gotten the point.

[Rough Edge racing]

 At full throttle engines make more power slightly lean rather than slightly rich. This also applies for throttle response...But emissions lean is more lean than what I'm talking about. Do these bikes have some sort of 3 way catalytic convertor?

[rodekyll]

My 15M system went goofy on me once and my VDSTS told me the ecu had reset its trim factor -- had been +15 at idle; pegged itself lean.  Someone told me it had to do with jump starting the bike.