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06-02-2021, 03:14 AM | #17 |
Top Contributor
Join Date: Nov 2013
Location: Italy
Posts: 6,188
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VBA 02514 - VROC 35394
VN 800 A - VN 900 Classic VN 1700 Vaquero Usque ad finem. |
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06-02-2021, 10:20 PM | #18 |
Sr. Member
Join Date: Oct 2016
Location: Minneapolis
Posts: 1,565
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Please post back after you have solved any issues 2016 1700 Vaquero 10/4/2016 2007 1500 Classic W/ Reckless Fairing, 42,000 miles 2004 600 Honda Shadow 18,000 miles 1989 500 Honda CX Custom 55,000 miles 1973 400 Kawi Triple 5,000 miles |
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06-05-2021, 09:02 AM | #19 |
Advanced Member
Join Date: Dec 2017
Location: Green Bay WI
Posts: 767
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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.
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My $1200 Vulcan, to start from.
Last edited by andyvh1959; 06-05-2021 at 09:11 AM.
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