Joined: Sat Jul 16, 2011 3:31 pm Posts: 93 Location: Portsmouth, VA
If that 'backfiring' is actually a mild 'put-put' on decel it's not unusual. Mine does that too and I'm not worried. When you say "backfire" I think a loud BANG coming from the intake, and that is really bad. A mild pop from the exhaust on decel could be an air leak in the exhaust or just the very lean burn of the air/fuel mix. There is a huge difference and it comes down to how we use the language.
If that 'backfiring' is actually a mild 'put-put' on decel it's not unusual. Mine does that too and I'm not worried. When you say "backfire" I think a loud BANG coming from the intake, and that is really bad. A mild pop from the exhaust on decel could be an air leak in the exhaust or just the very lean burn of the air/fuel mix. There is a huge difference and it comes down to how we use the language.
And my decel popping was virtually eliminated when I installed Todd's 02 optimizer.
Bruce
_________________ Bruce Brown London, Ontario, Canada 2009 Moto Guzzi Stelvio "Silvia Dionisio" WWPRD? (What Would Pete Roper Do?)
Joined: Wed Jan 07, 2009 5:55 am Posts: 134 Location: Pensacola, FL
pyoungbl wrote:
If that 'backfiring' is actually a mild 'put-put' on decel it's not unusual. Mine does that too and I'm not worried. When you say "backfire" I think a loud BANG coming from the intake, and that is really bad. A mild pop from the exhaust on decel could be an air leak in the exhaust or just the very lean burn of the air/fuel mix. There is a huge difference and it comes down to how we use the language.
Mine crackles like crazy on deceleration but I love it. It also alerts pedestrians! I've had a Quill exhaust since about 15k ago (which also eliminated the torque dip, but that's another thread) and revel in the rich, fruity sound of the Guzzi twin unleashed. If I wanted a quiet bike, I'd ride something else. Like a Honda.
_________________ They out there who don't ride what we do don't know what they're missing. And I won't tell them, either.
Ok guys, yesterday came the tech guy from BMW, calibrated the valve clearance (clearance was ok), replaced the spark plugs, and the bike holds the idle when the engine is cold He told me that those plug caps are a piece of crap. I ordered a pair of NGK plug caps, just in case. It was very annoying to start the bike and putting some gas for the first 20 to 30 seconds in order to maintain the engine running. Happy Guzzi owner
Joined: Sat Mar 09, 2013 9:55 am Posts: 24 Location: Westminster, CO
BravoBravo wrote:
And my decel popping was virtually eliminated when I installed Todd's 02 optimizer.
Bruce
Link please? I searched and found more than I could handle. I have the Mistrial exhaust on mine , and while it does not really bother me it does after-fire quite a bit on deceleration. I hate to mess with an almost new bike but want to learn more.
And my decel popping was virtually eliminated when I installed Todd's 02 optimizer.
Bruce
Link please? I searched and found more than I could handle. I have the Mistrial exhaust on mine , and while it does not really bother me it does after-fire quite a bit on deceleration. I hate to mess with an almost new bike but want to learn more.
Marc
Marc, Todd no longer sells the O2 optimizer as a stand-alone unit. It is now part of a fueling package:
I can't keep up with these threads, so always feel free to reach out to me direct email please.
That said, I spent a few hours at Dynojet yesterday, and the twin 02-sensor bikes are still unresolved. They are working on a software driven box to control the 02-sensors via the Power Commander V. They acknowledged that two 02-optimizers will certainly work, but it is not cost effective for them. I can offer a handful of twin 02-optimizer PC-V's for anyone interested for $524.95, or my ECU re-flash service is $500. Please contact me direct email to order, or I'll try to get them on the Store today or tomorrow.
Other 02 sensor offset foolers do NOT work (i.e. FatDuc), and have proven detrimental to fueling/engine life, as they are not capable of doing what's advertised on the newer ECUs (5AM & 7SM - Most ALL big block Guzzi). FACT: They go horrendously rich after one simple transition from closed to open loop and back.
_________________ Todd at GuzziTech.com SoCal GuzziTech Power Since 2001! Current Fleet: Stelvio, Griso 11 & 8V Tenni LE, V11S LM-R & Scura, Jackal & V11 Café Project, Super-charged 8V Hellion Project.
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I have the Mistrial exhaust on mine , and while it does not really bother me it does after-fire quite a bit on deceleration. I hate to mess with an almost new bike but want to learn more.
