I've got a snowblower I got off my neighbor that was built in the 70's. Last snow storm, it burned through it's oil and the engine seized up on me. I pulled the head off, whacked the top of the piston with the handle of my wrench and it moved! So, I put it all back together and it fired right up and runs like a dream! Single digits out, and it only took 4 pulls even though I had drained the fuel line when I took the gas tank off. Gotta love the quality on those old engines...