Have had this MAC140 chain saw for a while. It's been sitting around for at least a couple of years. I checked the compression and it's very good. I get a reasonable spark, so I put a little petrol in the spark plug hole and it does not fire up. Is there anything else I should do? Only other thing I can add to this is that the spark plug is hard to screw in by hand so I used a socket and wrench but I'm pretty sure the spark plug is on properly. [Linked Image]