I got this saw in pieces, replaced piston and put it back together. However, I know it's missing the 2 top cover screws. It fires up on prime, but will not run. I have a couple suspicions; impulse line and the odd carb intake gaskets? I'ts been in a box on my shelf for 6 months, and I'm ready to send it on to someone smarter and more motivated than me. I have a 385xp that I rarely use, so don't really NEEED this saw. David in souther oregon. 541 482 7739