De-cel Pop Fix?

[harley_jeff]

Just had a re-tune (TTS) and the bike has never run better except for a very annoying de-cel pop.  It happens between 2200 and 3200 rpm, give or take, when you go from about 5% throttle to closed throttle like when entering a tight twistie.  It also occurs when up up-shifting when you back off the throttle right as you up shift.  I take it this is not going to get better on its own.  How do I fix this?  One other thing - the bike has never done this before.

[BonesNL]

I use a thundermax for this, best there is. A open exhaust make it worse also.

Sorry for my english

[Just Nick]

Talk to your tuner he will fix it for you sometimes it can be a little of a pain and some bikes you won't get any decel pop on the dyno. It happens I'm sure he will fix it for you

[harley_jeff]

I took a close look at the exhaust and on the rear cylinder the two nuts were missing.  That explains the sound I heard on my test ride as I must have detected one of the nuts bouncing off the bike as it fell off.  Assuming the exhaust was loose when the dyno tuning was performed - does this invalid the results and do I have to pay again to have it repeated?  Or, can I install two new nuts (and hopefully that cures the de-cel pop) and move on?

[BUBBIE]

Personally;
I'd try the REPLACE Nuts and test ride... (buy exhaust nuts at HD)seen to many nuts replace NUTS with the wrong threads n design to hold...

THEN Talk to the Tuner and see what they say....

signed....BUBBIE

[BonesNL]

I would go to a good tuner, this one didnt see your header was loose

[pauly]

Gday jeff,
Do you have tts, the map that was installed, and are you ok to make a couple of adjustments?
If so, a slight increase or decrease in the ,... (Umm... Dang ... I don't have my pc on and will probably screw up the table name.....I think it's called) decel enrich (or something like that) table, around those revs will probably fix it.

Pauly

[hdbikedoc]

exhaust nuts loosen on dyno  usually check before going on and sure enough have had a few loose again when reinstalling heat shield etc so now always check nuts and bolts after dyno runs

[harley_jeff]

Two new nuts installed on rear header and front nuts re-torqued and pop cured.  I made an appointment with the tuner to have the AFR's re-checked this week.