update#2
ok.....
After further inspection of my new toy, I found a boldly stamped "C" on the cylinder. Since I am fairly new to 2 stroke work, doesnt this indicate the overbore? e.g. std, b,c
I measured across the bore at the top of the cylinder and was surprised to find it at just over 66mm and although with the rings inserted and true leveled with the top of the cylinder using a depth mic, there are no gaps between the ring and cylinder wall. I do etching and engraving and have a light table, so this is an easy thing for me to check.
I realize that the cylinder will be slightly larger below the ring line, which is why I measured at the top for the starting bore size. with the piston in {minus rings} using a metric feeler gauge, the piston to cylinder clearance at the top of the cylinder is .076mm while the center portion of the cylinder is.178mm . While I'm here I will also mention that closer inspection of the piston pin, the bearing portion was shiney and smooth but the outside seemed to have 'spun' in the piston though I cant verify any wear due to lack of proper micrometer. So... it seems this was a 'C' size then resleeved to standard but with no nikasil. Looks like its off to frp...but I will email Jeff first to see if he can check my piston for servicability while he has it there.
While that is happening I will have a very good local race shop split my case and replace all bearings seals and pin.
Full list of parts involved:
bike $1300
fmf rev pipe $207
bearing/seal kit $56
twin air filter $30
gasket set $39
boyesen power reeds $32+shipping
main and pilot {155/45} $13
cylinder porting $185
boring if needed $65
re-nikasil $165
dunlop 952 {f/r} $101
chain/sprokets $79 {steel front aluminum rear gold xring pkg.}
hotrods kit $89
engine split pin/rod install ~quoted "about 80 bucks"
man when i do it that way this is costing me a ton! But can you really put a price on fun? :laugh: