[speeder]

The stock bore on the bike is 71mm, (650cc). The P/Cs I'm installing are ~76mm, (750 kit). The combustion chambers are around 69.5mm, meaning that quite a bit if the border of the piston will be under the flat part of the head that does not have piston under it with stock pistons. Looks to me like I might still have a decent CR but a really weird squish band...not sure what the implications of that are, performance-wise.

I really need to find out if all of the kits are like this and whether there is an engineering explanation(?) Pictures tell the story better than I can: