Had problem with starter grinding on start often on my 07 SG. Side note, I have a chrome inner primary. I removed starter and took dremmel with medium sanding stone and ground edge of starter that makes contact with primary. Did the same with inside edge of primary. Installed starter added blue loctite to threads. Started and turned off at least a dozen times, no issues. Previously it would have grinded once or twice.
I did get idea from bulletin posted on here. I just didn't feel like leaving my bike at dealer for repairs.

 

It took me about 15 minutes.

 

sound interesting and makes sense......did you try it after the bike is fully warmed up? I'm going to look into this when i take the bike apart this winter for some mods. btw, onc my bike warms up, I can pretty much count on it to bang grind...but If I start the warm bike in gear...doesnt bang grind....

 

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I will let you know today hopefully. Been raining here a lot and too busy to give proper test. Going out today.

 

Can you describe in a little more detail? Thanks!

 

Makes sense. Isn't the ring gear already bevled.

 

Yes ring gear is beveled. Issue wasn't with that. Problem is grounding issue. Resurfacing faces of both parts makes better contact. On my bike having the chrome inner primary made the problem more evident. I will know today 100% if this resolved the issue.

 

I got it. Thanks.

 

interesting....so if you aren't ready to pull your starter to do this....maybe adding a large ground wire (like a battery led cable) from one of the two starter thru bolts nuts to a local frame ground will help.....something to try anyway.

I think you are on to something about the surface conductance, I ran a 6 gauge eyelet terminated battery cable from one of the starter bolt nuts to one of the frames main ground point. been doing stop and go stops all afternoon and its almost 100 degrees in nyc, so far, no starter grind noises. like I said earlier....it can't hurt....and maybe it will help.