Makita Saw Carburetor Cleaning & do you use Amazon spark plugs?

[@Victor-wz6fv]

I'm working on one of these saws. It backfires out the carb. Any ideas??

[@chrisdixon2525]

If the carburetor is clean and in good shape, you may need to check the flywheel for a sheared key.
Sounds like it may be out of time.