Springer Popping on Decel : V-Twin Forum: Harley Davidson Forums

Seegarsmkr · 07-20-2007, 10:36 AM

Hey Gurus,
Was wondering what causes popping on decel and how I can get rid of it.

I have done an upgrade after the break in. I now have V&H Big Radius 2:1, Airaid high flow filter, and a SERT. The tuner states that it is making 93 HP and 109 TQ but has "slight" popping on decel at higher RPMs and they were unable to tune it out.

What to do?

Seegarz

Deuce Bigelow · 07-21-2007, 06:57 AM

not sure on the SERT, there have been the same reports of poping on decel with the thundermax and a "fix" has been posted in the Tmax thread, maybe you can "adapt" it to your SERT MAP?

I don't know what the fix is because my Tmax has never popped on decel........

Seegarsmkr · 07-21-2007, 08:15 PM

Thanx for the reply and a beaute you have there.

Deuce Bigelow · 07-22-2007, 07:53 AM

Thanks!

when will you be in NJ?
and where in NJ will you be?

maybe we can do some riding...

mrmagloo · 07-28-2007, 08:39 AM

John Golden claims that provided the tune is correct, popping is a result of an incomplete seal of the header gasket and air is being sucked in causing the pop. He's got a write up telling folks to install new gaskets and tighten the bolts finger tight. start it and bring it to operating temp. Let it cool down over night, and tighten them another 1/4 turn. You do this complete cycle until you get to the right in/lbs. Supposedly this will solve the problem.

I've been meaning to do it, but who has a week to go through this whole ordeal. I just live with it....

Seegarsmkr · 07-28-2007, 08:56 AM

Quote:

Originally Posted by Deuce Bigelow

Thanks!

when will you be in NJ?
and where in NJ will you be?

maybe we can do some riding...

Hey Duce I will PM you on CVO when I get there...hopefully my family wont whore all my time there...but would like to get together with you and Howie, et. al.

Seegarz

Seegarsmkr · 07-28-2007, 08:58 AM

Quote:

Originally Posted by mrmagloo

John Golden claims that provided the tune is correct, popping is a result of an incomplete seal of the header gasket and air is being sucked in causing the pop. He's got a write up telling folks to install new gaskets and tighten the bolts finger tight. start it and bring it to operating temp. Let it cool down over night, and tighten them another 1/4 turn. You do this complete cycle until you get to the right in/lbs. Supposedly this will solve the problem.

I've been meaning to do it, but who has a week to go through this whole ordeal. I just live with it....

Thanx Mr Magloo,
I do have a slight seepage around the gasket...barely noticeable...but if oil can leak then air can seep in as well...thanx for the pointer.

Seegarz

**rosascycle** · 10-06-2008, 01:04 PM

Air leaks are a very imporant part of decel poping, Don't over look adding or removing fuel with that racetuner to cure decel poping. We see that to be the cause, more often than any exhaust air leak.

Kev · 10-16-2008, 03:17 PM

I have a 2008 se springer with V&H 2-1 and V&H fuel pak
and yep it pops on decel especialy if its on part throttle

kev

vbagger · 10-24-2008, 02:13 PM

I would agree ,either a little lean or leaking gasket.I don`t know which gaskets V&H uses to match with their flange.The James gaskets are different than stock,maybe they will seal up easier.