gs7_11

Correct. It's either a 550 or a 650. Definitely not 89 also, unless late registered old stock.

Yeah, GS650.

The problem Hoppy will have is that there are 2 tap mounting hole spacings on Suzukis of this era, 44mm and 50mm. The taps with no lever have a 50mm spacing and so far, I've never seen a suitable replacement with a lever.

https://mc.grenasberg.no/2022/12/28/alternator-for-gt750-and-gt380/

The latter, so the plunger is free to move against cam chain tension under pressure of the spring.

Not according to the compatibility checker on CMS.

Oh, and just looked on CMS..... the GS450 rear brake plate is the same and there are several on Eblag.

Nearly. The GS400 is half a GS750. Same pistons, 65mm. The GS425 is the same but with 2mm bigger bore. The GS850 has 69mm bore. But yeah, it's a classic GS engine, lots of parts in common.

I love mine. Hope it's being done right.....no brown seat or hacked-off frame.

If you compare these 2 gaskets (Cometic fibre and Suzuki MLS) you can see the difference in the cam chain tunnel area, and why one needs an o-ring and one doesn't). It's stated on Fowlers website that the new genuine MLS gaskets don't need o-rings. Fibre gaskets still do. Basically, if the gasket has a space for the o-ring, fit one.

Isn't it the new (genuine Suzuki) MLS head gaskets that don't need the o-ring?

Doesn't sound right to me. Pretty sure mine's got an o-ring.

The OPs bike is already an 1100.

It's a lot of effort and trouble to do this on this bike, and being a shafty, maybe not the best starting point? Perhaps the lack of available tuning parts is a clue? Anything's possible of course.

I'm surprised there are a lot of options out there, assuming your bike is the 8 valve shafty (g model). Are you sure you're not looking at 16 valve pistons?