Got a "new" engine for my 1811. Doesn't smoke, starts good, has about the same hours but better PO care, so I'm told. Came out of an 1862 that had tranny problems and fuel tank problems. My 129 found a new home so I could get this motor. I did the swap last night and it runs great, compared to the old motor

No smoke, no knocking, and didn't burn any oil (plus it had the flywheel guard and an air cleaner with no holes in it). Good news is now I've got a spare M18 sitting in my shop for parts should they ever be needed. Anywho, here's a pic of the new motor next to the old one. The new is the dirtier one

In this pic, I hadn't wiped it down or anything else. After I took it, I removed the shrouds and found a surprisingly clean motor. This had been sitting for about a year so that accounts for the dirt...I guess