This is what I found on changing out the compensator, rotor/stator etc.
Just a little grinding, not too much at all.
I have an oil leak on my 2010 SEUC where the stator cable comes out of the crank case so I need to pull my rotor to get at it. I removed the primary chain tensioner, compensator assembly and clutch assembly and I see that I have a slightly different lip on my inner primary.The lip that prevents pulling the rotor extends to the gasket surface which means it doesn't look like I can grind any material off without taking away gasket surface area for the primary cover. The only reason I can think that the moco would do this is to sell overpriced inner primary gaskets and inner primary bolts with the o-rings. Even after discount it's still $30 in parts that should not have to be spent with some half decent engineering, and for the guy that has to have the dealer do it it's more labor too. What's the best way to repair, clean it up and put some high temp black silicon gasket maker on the stator cable where it comes through the case?
On the bright side my -08A SE compensator with 20,000 miles on it appears to be in very good shape, no wear on the ramp lobes or teeth. There is some wet reddish brown rust looking material on the splines of the metal but it wipes off.