First overbore is most likely + .25MM, and if you can't easily feel the lines in the jug, that should probably clean it up for ya. I'd replace everything on the top end while yer at it - wristpin, wristpin bearing, circlips and all the gaskets. I'd also stick to dino 2T oil, because that's what it was designed to run on. Suzuki's branded oil is VERY good, as is the Yamalube product (made for them by Spectro), and both should be available at local dealers.
Nice find, by the way. Even if you add another 2 hundred in fix-up, yer 'lil Suzi's still a bargain! Let's hope those crank seals are OK....
" A man that can have patience, can have what he will." - Benjamin Franklin
"Man cannot imagine how life could be more difficult or complex. But Congress can." - Cullen Hightower
Honestly, I *do* like Socialists. They just need a little tartar sauce.