I wouldn't touch a 750....they're not very fast even as 900s, you wouldn't want to loose a chunk of midrange. Mine has hi-comp pistons, flowed heads, FCRs and a full system and still is what I would describe as entertaining, rather than fast.
That said, they are very straightforward to work on, so I suppose you could always stick a 900 top end on if you wanted. It will always be worth less as a 750 though.
I wouldn't touch a 750....they're not very fast even as 900s, you wouldn't want to loose a chunk of midrange. Mine has hi-comp pistons, flowed heads, FCRs and a full system and still is what I would describe as entertaining, rather than fast.
That said, they are very straightforward to work on, so I suppose you could always stick a 900 top end on if you wanted. It will always be worth less as a 750 though.