B02S4
Learned Hand
Reged: 02/28/08
Posts: 1569
Loc: USA
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Quote:
...Ifit true that it is just unburnt gases exploding in the headers, then that would point towards a rich mixture, correct?
Well, that's a big "if"; there's a difference from the lean prolonged burn of decel popping in the pipes/carb-spitting & that of rich mixture "BANG" exhaust ignition.
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rgoldberg
Adjunct
Reged: 09/15/10
Posts: 275
Loc: Vail, Az
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In both cases I've only has decel popping.
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"stupid's in the water these days, they're gonna drink it anyways, until they don't know right from wrong..."
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MACMC
Loquacious
Reged: 12/16/06
Posts: 2528
Loc: Kansas City, Mo.
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Try turning your air fuel screws out till the popping stops. Back 10 years ago when we started installing open pipes that was the cure.
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jyatesmp
Adjunct
Reged: 05/11/10
Posts: 175
Loc: DFW
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sounds good. Thanks
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07 TBA, 32" Turnouts, DIY Freak, hard saddlebags, 18" screen, dresser bars, highway pegs, floorboards, fog lights, amber run/turn lights front, red run/turn/stop lights back, blue speedo/tach lights, LED console lights
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MACMC
Loquacious
Reged: 12/16/06
Posts: 2528
Loc: Kansas City, Mo.
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Quote:
In both cases I've only has decel popping.
Actually a perfectly tuned or lean bike with open pipes will pop on decel, I know that sounds counter intuitive.
For example, in the spring of 2003, I installed wide open Septres, rejetted, added a Unifilter and balanced the carbs, the America ran great, but all hell broke lose on decel. I thought well it's too rich, but on this site the advice was to turn out the AF screws, it worked, just a rumble on decel.
Not long after, I took the bike in for it's first scheduled maintenance check. I picked it up, started home and the at the first decel all hell broke lose again. I pulled over and turned the AF screws back out, I had already installed the thumb screw needles.
When I got home, I called the tech that had worked on my bike at Engles and ask what all he had done. He said he had installed some chrome fork covers, changed the oil and completely check out the bike. The tech said the carbs were in perfect balance when he checked them, but the bike was running a little rich off throttle when he hooked it up to the exhaust gas analyzer so he turned in the AF screws. 
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