There are a couple of things that can cause trouble. There’s a good chance the chain may be worn internally; as soon as it heats up, it’s too loose and jams itself. If it’s one you’ve been using for a while, you might want to get a fresh blade.
The rest of it is the running of the engine; proper mixture of gas, fresh gas, and then messing with the carburetor - don’t.
If the “jets” are getting clogged, you need someone who knows what he’s doing, although you can acquire the tools and techniques and teach yourself. You do have lots of spare time, don’t you?
Spare time is the one thing, besides finances, I lack an adequate supply of.