Finding out more about my Vaquero

[forgetaboudit]

Thanks! I'm not fond of the hypercharger for sure. I like the other intake kits, but I feel they're way pricey for what they are.
I've got a Suzuki M109R that I've modded pretty heavily, and I'm assuming the fiance won't want to go down that road again at the moment ��

[SUMMITRIC]

I have the same Cobra Tri-Ovals on my Vaquero. It used to backfire and even hesitate on accel and decel. Bought an Ivan's tune ECU off a fellow member here, and it's like a whole new bike. Still nice rumble, but smoooooooth accel and decel. Definately more power and better throttle reponse, and better gas mileage. Well worth the coin. Get rid of the fi2000 tuner. Clean your muffler tips, they really are shiny chrome under all that carbon soot.

[forgetaboudit]

Good to know. Now I have to convince the fiance its a good thing to do.
I'll clean it up one of these days ��

[andyvh1959]

Just a comment, its not "backfiring", just decel popping in the exhaust. Easiest way to prove it is to pull in the clutch when you hear the popping on decel. Clutch in the popping stops immediately. Decel popping is VERY common on any bike with a modified exhaust. Stock exhaust is designed to dampen out the decel popping that most any current bike exhibits. But people mod the exhaust, change the exhaust for more sound, and the damping is gone, and we hear the decel popping.

True backfiring is a fuel/air ignition event that only occurs when an intake valve is still partially open and the spark fires the mix,...and it "burps" backwards out the intake. These days true backfiring is very unlikely because ignition control is so accurate. Back in the days of points ignition it was much more common.

On a bike with modded exhaust/intake and a fuel/air controller the easiest thing to reduce the decel popping the fuel controller (Power Commander, Dobeck, Cobra, etc) is adjust the idle pot slightly to enrich the closed throttle fuel/air mix. Ivan's Flash should also be able to adjust the fuel/air map to reduce the popping. SUMMITRIC replied he had the Ivan Flash adjusted on his 1700 and the issues largely are gone. Wordy reply, I'm sorry, but posts here and on many other motorcycle forums about "backfiring" are mostly wrong and even service managers and techs at cycle shops describe it wrong. I bet many a service manager at almost any Harley or Indian dealer gets "backfiring" complaints from any bike owner that has had the stock exhaust and intake replaced by aftermarket systems for more sound (noise most often) and performance. Unless the intake and exhaust, fuel and air, are all properly balanced most often the bike LOOSES power where most riders actually need/use the power.