I am a big guy, just under 300lbs. shameful to admit. But I think at least a 500cc should be able to push me up some hills...
. I mean a buddy of mine is about same weight and he rides a GSX750 and it moves him pretty good. I personally think for this build I wouldn't need more than a 500cc, but if a 250 could work, I'd look into one of those as well. probably save a little $$ there too.
I have also been checking the ebay as well. I have seen a couple spindle/hubs listed for a yamati 90 something like that. Would those be too small for this build, seems like prices on those are less than I find for 300cc and above parts. Taking anything into consideration I can find.
ThX
GDA