Originally Posted by biodale
It is probably an air leak in the fuel lines somewhere. It is a Stihl so of course you do not have to replace itl. Make sure you replace the starter bulb as it may have a leak. Or the black gasket under the bulb. (that is the problem most of the time). Have you checked the timing of the valves. I think your edger is a 4 stroke hybrid. Valve timing can cause hard starting. Even if you take it to a shop it will be well worth your money.
Thanks for the advice and yes it is a 4Mix (as Stihl calls it). The bulb and gasket are brand new on the carb (they come pre-assembled), but I'll check to make sure they are seated. If its not that, I'll run it by my dealer.