Sound is exactly what I had before changing to the SE Compensator. It is it , sounds the same as mine

 

Starter Clutch IMO

https://www.hdforums.com/forum/touri...sator-why.html

 

My 2010 SG does the same thing since new. Took my bike to a dude who really knows his chit and he said it's the compensator and not to worry about it so I don't.

 

read the whole starter clutch thread and am unconvinced. Seeing as how anyone who hasn't upgraded their compensator probably should I'd go that route first.

Here's the thing about the stock compensator on '07 to '10 model years - the cam slider and shaft extender can get badly gouged. You can't see this without taking the compensator off the bike and inspecting it. The gouging causes the cam slider to temporarily lock up. When there's enough torque it will break free and in doing so cause a knock/bang.

I stand by my findings in this post:
https://www.hdforums.com/forum/touri...mpensator.html

 

2 Real Good DIY for SE Comp. Replacemrnt

http://www.hdtalking.com/transmissio...sator_kit.html


http://www.hdtalking.com/electrical_...placement.html

 

I think replacing the compensator would've been cheaper. Let's hope there aren't any flaws in the 11s.

 

Sounds a lot like a compensator...however, it could be a few other things...

Starter clutch
Auto tensioner on the primary chain messing up
Even a bad or loose motor mount

If it is still under warranty, have them chase it down and fix it.

If not, start checking and eliminating what it's not before you start spending $ and time.

 

I'd find out what the "UPDATE was for. My 07 FLHT STD made a similar noise. I never worried about it. I traded it in on a 2011 FLTRX 103. I'd be interested in knowing what the upgrade was for. Good Luck

 

Yup - done 4 of these now - one '07 with tear down to inner primary and beyond (boogaloodude's)

see: https://www.hdforums.com/forum/touri...acific-nw.html
and
https://www.hdforums.com/forum/touri...ll-pac-nw.html
for the most recent

 

First time I heard the loud bang starting was the first time I heard my brother start his 08 Softail in 08.
I traded for a used 08 Ultra last year and it does it also.

The 98 I traded in would get what felt like slack in the drive train not long before I would take it in for service. It would be gone after getting it back.I figured they must have adjusted the primary chain?
The 08 had it before getting it serviced and still had it after getting it serviced. Guess I'll have to ask about the compensator.