Finding out more about my Vaquero - Page 2

forgetaboudit · 06-01-2021, 04:18 PM

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 ��

The Black Knight · 06-02-2021, 03:14 AM

Quote:

Originally Posted by ldhthept

.... Congrats on the upcoming wedding.

mbarr10 · 06-02-2021, 10:20 PM

Quote:

Originally Posted by The Black Knight

andyvh1959 · 06-05-2021, 09:02 AM

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.

06-01-2021, 04:18 PM	#16
forgetaboudit Jr. Member Join Date: May 2021 Posts: 24	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 �� Login or Register to Remove Ads
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06-05-2021, 09:02 AM	#19
andyvh1959 Advanced Member Join Date: Dec 2017 Location: Green Bay WI Posts: 755	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. __________________ My $1200 Vulcan, to start from. Last edited by andyvh1959; 06-05-2021 at 09:11 AM.
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