since the GS 400 and GS 750 use the exact same pistons, putting the wiseco 844 kit into one of these bikes seems like an obvious answer to building a performance engine on one of these lightweight machines.
as tempting as it sounds to use some GS 500 sleeves in the 400 block and use custom made big bore pistons, I doubt that much in performance gains would be there to have had without upgrading to larger valves, which aren't very possible to go much bigger on, & would be way more costly than one of these bikes could justify.
simply boring out the cylinders and putting in these pistons to make a 449cc 10.25:1 compression mini-powerhouse using a custom bore Cometic head gasket would be pretty simple, but would be pushing it as far as resale value on the bike vs the investment.
I have read on here before about someone hot rodding one of these old twins and saying that the bike had such an impressive power to weight ratio that it would just about throw people off of the back on sudden low speed WOT twists because it was a wheelie machine! A longer/stiffer GS1100E allow swingarm would be a good investment, but would also require going to rear disc instead of drums due to brake stay placement.
I was wondering if many people had done this mod before, and how much performance potential the bike has with this, pods, jets, and free flowing mufflers or two into one?
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