I dont know but when i got the "starter crunch" thing i did ask around and some people said that they just changed the starter or replaced the starter clutch and it was fine for them. Since i was dealing with this issue myself, i bought both the starter clutch and the SE comp. Not wanting to spend the $250 for the comp i dove into the starter first. Seemed fine til it got hot and then the crunch came back. Back in i go and tear it down. I replaced the comp and havent looked back. No issues at all anymore. I was told the bad comps will eventually take out the starter. Maybe i didnt even have to rebuild my starter
I'm just trying to understand if this is more than one problem. In the past we had a burly compensator sprocket. Evo's would starter stall, or kick back (starter crunch), Shovelhead kickers would launch guys when kicking back, Early twin cams with hot rod parts raising compression kick back (starter crunch)....
My point is that this is not a new problem. I've not seen the SE compensator sprocket and my 2005 had the old style compensator. My TC95 would kick back stone cold after sitting all night 1-2 times a week, and the same thing after work. If I stopped for gas or a butt break, I'd get kick back majority of the time. When I had comp releases, I never, ever had a problem. Without comp releases, if I rolled the bike backwards a few feet in gear, never, ever have a problem.
You were right to rebuild the starter, because that sound you hear is the primary chain, basket and starter bendix stopping the engine from starting backwards. The crunch is hardest on the starter gears and bendix.
On my high compression Evo, installing travel limiters in the tappets fixed the problem 99% of the time. My buddy with a 113" twincam ran travel limiters too because his bike wouldn't start with compression releases... In both of these cases the limiters keep the tappet from bleeding down and creating an artificially short cam duration. If I had kept my 2005 RG I would have put limiters in the tappets.
I'm assuming that the crap Twincam compensator used for a few years adds *another* reason to have this problem. I'm just not understanding why. Hence my questions and outloud thinking...