Just scored an old Troy-Bilt Super Tomahawk 10 hp chipper for $100. Found it in a guy's back yard when I went there to pick up something else he had for sale and offered him cash. It's an early 90's model with the Tecumseh I/C and it is built like a tank. It has the original manuals, leaf tamper, an extra screen, and a brand new spare chipper blade. He even threw in some free cockroaches living in the debris in the chute. He said it shook a lot the last time he ran it a few months ago. Then it got real noisy all of a sudden so he shut it down immediately. Now you can turn the crankshaft over not quite a full revolution, unless you really force it. I suspect a slightly bent crank. I plan to pull the recoil cover and cylinder head and rotate the crank by hand looking for any play of the conn rod or visible run-out at the flywheel. Any other ideas? I already found some threads on here that talked about crankshaft straightening so I will talk to my local small engine shop about that as soon as I get the engine torn down to the short block and figure out what's going on.