Exhaust popping on deceleration
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Might take 20 years or so but it'll be fixed!!!!!!!!!
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Seasoned HDF Member
Joined: Sep 2012
Posts: 6,570
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From: almost there
That's why I posted here. Im re-researching.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
Plug color is still important you just have to know that (due to the ethanol) the proper plug color is no longer a tan to caramel color but just off white.
If you tune your front plug to just off white to an extremely light tan then you will be good.
Tourer
Joined: Jun 2013
Posts: 317
Likes: 48
From: Minnesota
If you're going to dis several posts by several experienced Evo enthusiasts you really ought to explain yourself, lest you be considered a troll.
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Seasoned HDF Member
Joined: Sep 2012
Posts: 6,570
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From: almost there
Always bad? depends on who's giving the advice
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Seasoned HDF Member
Joined: Aug 2008
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From: Ohio
What is wrong with it then my man, throwing rocks from behind the women isn't the answer either.
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Joined: Aug 2008
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From: Ohio
It is just pulling more air backwards than the little engine. Problem with big engines is they need to breathe but pull air backwards when slowing down and once again a fine line with performance exhaust.
A 2-1 can still pop so not a in stone fix, some use step tube pipe sizes to combat air being pulled backwards but doesn't always work if the muffler is too big or non restrictive the step tube design can be over ridden
I run a Dragos which has a step tube design, 3" muffler with a small layer of packing the length of the muffler, it also has a 1/8" bar at the outlet and can only relate to a restriction device. On EFI bikes the 0 throttle position in the RPM range 1500 and up needs fuel added to kill the dreaded pop on decell, sometimes .5 afr added cures it, sometimes takes 1.0 afr added. I needed to run my carb idle pig rich 12.3 to keep enough fuel in the pipes to cool it down for a decel pop cure but when my small layer of packing starts getting hard and doesn't do nothing, it will start to pop again because of slighter free flow. Since adding more fuel is out of the question at 12.3 afr idle, I'm left with 2 choices, keep replacing the packing when it gets hard or cross the ghost pipe Dragos 2 1/2 muffler on left to the live side to slow down the air, Since I'm stubborn and want the flow, most likely going to try using header wrap as the packing this time, Dragos is recommending the wrap as a replacement packing since it can take the heat better.
Babble simplified, a 2-1 can still pop and still needs attention on a big engine. Need a exhaust that the flow can be adjusted for a safe way out of not wasting your money for instance, V&H Competition 2-1 has a large straight thru not much of a baffle but removable, can alter it's flow by changing the baffle hole size
A 2-1 can still pop so not a in stone fix, some use step tube pipe sizes to combat air being pulled backwards but doesn't always work if the muffler is too big or non restrictive the step tube design can be over ridden
I run a Dragos which has a step tube design, 3" muffler with a small layer of packing the length of the muffler, it also has a 1/8" bar at the outlet and can only relate to a restriction device. On EFI bikes the 0 throttle position in the RPM range 1500 and up needs fuel added to kill the dreaded pop on decell, sometimes .5 afr added cures it, sometimes takes 1.0 afr added. I needed to run my carb idle pig rich 12.3 to keep enough fuel in the pipes to cool it down for a decel pop cure but when my small layer of packing starts getting hard and doesn't do nothing, it will start to pop again because of slighter free flow. Since adding more fuel is out of the question at 12.3 afr idle, I'm left with 2 choices, keep replacing the packing when it gets hard or cross the ghost pipe Dragos 2 1/2 muffler on left to the live side to slow down the air, Since I'm stubborn and want the flow, most likely going to try using header wrap as the packing this time, Dragos is recommending the wrap as a replacement packing since it can take the heat better.
Babble simplified, a 2-1 can still pop and still needs attention on a big engine. Need a exhaust that the flow can be adjusted for a safe way out of not wasting your money for instance, V&H Competition 2-1 has a large straight thru not much of a baffle but removable, can alter it's flow by changing the baffle hole size
Last edited by 1997bagger; Sep 24, 2017 at 08:49 AM.