That 7-10 has done some work now, looks tough.
So i got my sp70 yesterday, it was locked up. Engine is totally junk. But, i have contacted bob johnson and he is gathering all the parts for me. He had a nos cylinder and piston for it, all new bearings and seals. Full gasket set, and a few missing starter screws (long ones). So this saw will live to cut again in a few weeks. The only thing i need is a sp70 or sp60, rear engine shroud. The one on it is all sorts of cut up. Its more missing than there. If anyone has one id sure appreciate the help on it. #85747A. I did find one on ebay but the asking price is $76.00 !! The engine was that much. So im gonna wait on that to see if i can find one.