RE: stuck carb
I have bought engines off *bay which were totally gummed up and couldn't be moved at all. They hadn't been used for years, in some cases 10 years or more.
One minute, or less, carefull application of a heat gun melted the goo and allowed the engine to turn and the carb to move. A bit of fresh fuel flipped through it and then a quick run usually sees the engine working again.
This has worked on several engines now and is accomplished in a minute or less.
Reg