We have one at work and i can't get the saw to stay running. 2 yrs ago we thought it needed a muffler cuz it wouldnt run right< but if u took the muffler off it would rung great. Sooo 2 yrs later we finally got a muffler and this is what happens. Sometimes its starts for or it won't even pop. When it does attempt to run for 5 seconds it wont take any throttle and then dies. The carb got rebuilt and muffler got replaced. 130 psi of compression. fuel filter not clogged. I do see air bubbles in the fuel line though. I tried searching on here to find people with the same problem but didnt find much info.