1. Is MM oil methanol based or patroleum based?
2. The carb probably needs to be completely taken apart and thoroughly cleaned.
3. Replace the glow plug.
4. Replace the fuel tank.
5. Replace the fuel lines.
6. OK.

1. Close the HS needle to about 1 1/2 to 2 turns.
3. Open the throttle all the way to prime. Webras usually take 4-5 flips.

Replace the fuel. Give the engine a fighting chance with NEW stuff, not cleaned-up old. I'm guesing the old fuel is a big part of your problem.

Dr.1