Adjust air bleeds on closed loop?

[vaclav]

So I opened up the stock exhausts on my '07 s2r 1k a little bit and the bike seems to be running a little leaner on closed throttle deceleration. It backfires worse than my dog regardless of engine temperature. Does anyone know from experience if I can richen it up a bit from turning in the air bleeds or will the closed loop cancel that out? I have read the thread(s) about closed loop mods but I would rather not throw more parts at the bike if I can find an answer w/ tuning.

[printman]

I dont recommend playing with the airbleeds

if all you did is open the exhaust it should be fine, unless you notice it surging more than normal.

opening the airbox will cause problems with little choices on fixing them as of now

[vaclav]

It is backfiring and surging. The surging goes away as it warms up ( which happens fairly quick in AZ) but is always there. As I recall it was there before, but less pronounced. I was pretty surprised by the whole thing. I was under the impression from reading other threads that air flow volume on these bikes was controlled by the airbox/filter and the udder. Anyhow I am not looking to "play" with anything, but I do want to explore solutions  to this problem I created that may already exist on the bike. Why would I have to alter the airbox? I thought these screws were on the throttle bodies as shown in the service manual (item #20 on page 48 of "2006 Monster S2R 1000 service manual"). Am I looking at the wrong screws"?

[printman]

The surging and backfiring is from a lean condition, which the bike comes from the factory already lean to meet Euro 3 standards.

By adding only a slip on, it doesn't change the airflow that much, because as you stated the udder already allows enough backpressure.

Most people open the airbox as one of the common mods done, but by doing that opens the amount of airflow into the motor causing an even more lean condition. Lean isn't bad, however being overly lean will damage things.

The air screws will not change the lean/richness setting, only an aftermarket programmer or DP ECU for the Termi exhaust bypass the already lean condition.

I would talk to a dealer, or someone locally with more FI experience, mine is limited. 

Have you seen this thread:   http://ducatimonsterworldwide.org/index.php?topic=655.0

[vaclav]

Yes, I have read that thread. Maybe I should rephrase my question. I have cored out my stock mufflers. I have made no other changes to affect the air fuel ratio. Is there anything I can do that does not involve spending large sums of money to compensate for the increased leanness I have observed since making this modification? As I see it, from what I have read here and elsewhere, my choices are to either go back to all stock (which is still a little lean for me) -or- spend a pile of money on parts combinations none of which have consistent results (except the full DP setup).

[mxwinky]

Actually you can affect some change by opening/closing the airbleeds.  My dealer did it on my Tricolore after I complained about a small bit of backfiring through the airbox during low-speed around town riding.  It definitely lessened the occurrence, though hasn't eliminated it completely.  Whether this would be enough to offset the muffler "coring" you've done is unknown, but it wouldn't hurt to try.  If it's backfiring on decel then you know you're running too lean so richen it up.  If that doesn't cure it everything I read and everyone in-the-know I talk to seem to agree that the best fix overall is the DP ECU that comes with the Termi system.  Mine gets the full 50mm carbon system next week.  Quite expensive, but worth it.

[Monstermash]

 I can't believe I'm going to be the first person to mention this in the thread.

Most people have found satisfactory results by unplugging the O2 sensor. It's a zero cost mod so you don't have to worry about spending any cash.

All you need to do is follow the wire from the O2 sensor up to the plug. It's right on the frame on the left side of the bike. Disconnect the battery and then unplug the O2 sensor. Leave the battery unplugged for about 1/2 hour. Reconnect the battery and ride, no more popping on decel. Have fun!  [moto]

If you still find the bike is popping a little on decel, stop the bike and turn the key on and off about 6-7 times. on the last on/off cycle leave it on and let the gauges sweep like normal and then start it up. You're good to go!

[vaclav]

Thanks for posting your procedure. I had pretty much ruled that one out in my head because it sounded like the results were inconsistent, or that it helped for a while but then the bikes would revert to the old lean symptoms. Have you heard/read different?

[NAKID]

Once you have unplugged the O2 sensor, try this
http://cgi.ebay.com/ebaymotors/DYNO-BOOST-PERFORMANCE-CHIP-DUCATI-MONSTER-749-749R-999_W0QQcmdZViewItemQQcategoryZ34284QQihZ001QQitemZ110254530121QQrdZ1QQsspagenameZWDVW
I want to give it a shot to see if it will richen up the mix a bit since I have the boomtubes and no O2 Sensor. Hell, it's less than $50 shipped. If it doesn't work, you aren't out much...

[Duck-Stew]

If unplugging the O2 sensor does work for you, then remove the sensor very shortly.  Running the O2 sensor w/o it being hooked up will kill the sensor and if you need it again....well, you would need to buy a new one at that point (big $$).

[Monstermash]

Once you have unplugged the O2 sensor, try this
http://cgi.ebay.com/ebaymotors/DYNO-BOOST-PERFORMANCE-CHIP-DUCATI-MONSTER-749-749R-999_W0QQcmdZViewItemQQcategoryZ34284QQihZ001QQitemZ110254530121QQrdZ1QQsspagenameZWDVW
I want to give it a shot to see if it will richen up the mix a bit since I have the boomtubes and no O2 Sensor.

Your finding you need to richen up the mixture with the O2 unplugged? Are you sure? I only ask because I am finding that my bike runs a little too rich with it unplugged. I'm running an exhaust setup similar to the Boom Tubes so it sounds a little strange to me. I'm actually thinking of adding a K&N air filter to see if I can lean it out a bit.

[clubhousemotorsports]

In answer to the air bleed question most of the bikes that have an o2 sensor the bleeds come through from the factory fully closed.

[Monstermash]

In answer to the air bleed question most of the bikes that have an o2 sensor the bleeds come through from the factory fully closed.

Meaning that they are adjusted to the richest possible or the leanest?

[NAKID]

Yeah, I'm pretty lean. When Mark made the set for me, he had to end up baffling the system to give it some back pressure. He said it sounded awesome, but was waaaay too lean...

[flsurfdog]

Once you have unplugged the O2 sensor, try this
http://cgi.ebay.com/ebaymotors/DYNO-BOOST-PERFORMANCE-CHIP-DUCATI-MONSTER-749-749R-999_W0QQcmdZViewItemQQcategoryZ34284QQihZ001QQitemZ110254530121QQrdZ1QQsspagenameZWDVW
I want to give it a shot to see if it will richen up the mix a bit since I have the boomtubes and no O2 Sensor. Hell, it's less than $50 shipped. If it doesn't work, you aren't out much...

Holy crap.  too good to be true?