I searched and this doesn't seem to have come up before here, so...

https://www.youtube.com/watch?v=2TgYZPvAPTs

you'll see it mentioned on badweb if you use the search function. It's supposed to make the engine quieter by shimming out any rockershaft movement

That looks worth doing..

Seems to be a solution to a non problem, I've never heard all this clattery bollocks

Must admit when I pulled the S1 apart I didn't notice any witness marks on the rocker shafts

Hmmm.......this is an ancient, well documented issue and I'm amazed that nobody has heard of it before
I would say that 50% of the bikes I strip have witness marks on the bolts, the rest have interference fit shafts.
The other fix is to cut a slot through the mount so that the bolt clamps the shaft in place.

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

My motor sounds top end tappety.

Not the least bit worried about it after 16 years on my twinkie. The problem I would have with tightening everything up like that is hoop stress on the cam support plate journals as everything heats up. Eventually everything loosens back up. The shafts can't expand like they want so they exert force on the journals. Then they open up over time. Back to square 1.

On HD based products. If it's quiet, something's gone wrong.

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Bob Krzeszkiewicz
2012 XR1200X - 2011 Kawasaki Z1000SX - 1999 Buell X1