300 series won't start even though I used it 2 weeks ago. Is it the timing? If so,how do you time it?

If it ran fine 2 weeks ago when you shut it down, the problem is likely with the fuel. Drain the bowel and check to see that the needle valve makes a complete seal when raised up. Clean any debris. Reassemble the bowel and try to start it. Come back and tell us what happened.

Good place to start there ball. Any luck grayfoxxy?

If it ran two weeks ago the timeing is fine so don't go tearing the engine apart because you are an idiot and you don't know what you are talking about!!