I got bored with of my Craftsman 55cc (biggest sears had 3 years ago). Cuts great as long as you keep the RPM's up. Just dosn't seem to have the torque at low RPM's a motor that big should have. I have a 1980's Pioneer Farmsaw that hasn't run in about 15 years because the compression release rod broke and it kept tearing up starter pulleys. Drilled a hole in the pull start cover, push the button while starting, runs great. The chain is beat, but its .058 x 3/8. Can I use a .050 x 3/8 as long as I change the bar? Can I use any 3/8 pitch chain as long as I change the bar? Thanks.