You guys may find this post interesting on a rainy day. A logger backed over his MS 661C M-Tronic with a 25,000 lb skid loader. The handle bar looked like a pretzel, somehow the bar and chain survived, and the engine still had compression and turned over. He decided to have me repair it. That required over $500 in new parts -- handle bar, brake handle, tank housing, air filter, filter base, AV spring, pull cord housing, etc. It adds up fast. He claimed that after he ran over it, the saw started and ran, so in his mind, repairs were thus justified. I was skeptical, but compression was at 155 psi., so I went ahead and ordered the parts. Well, lo and behold, I also discovered during the repair that the fuel line to the carb was completely broken off along with the carb's intake nipple. And, the intake manifold boot was cracked almost in half. So, the carb was not getting any fuel from the tank, and even if it did, any fuel-air mixture should have been lean. As such, how long could this engine have run after it was squashed, assuming that he actually did start and run it? Any ideas?