Start with the simple stuff- is the muffler screen plugged? If they can't exhaust the charge they'll do just what you describe. I've had at least a dozen weed whackers do that.
The 330 is a pretty nice little saw. I've worked on a couple. IIRC that model has a boot that goes between the carb and jug. If that's torn or has a hole in it you won't get it to fire much. Bad part with that is that you have to buy a big assy to get the boot, it's not offered separately that I've seen.
It's possible it's off time, but that's a pretty rare thing IME. On an electronic ignition, as I understand it, the spark is triggered by the magnets as they pass by. There's an Ebay auction for a coil for about $20.00 on right now. Just enter Echo 330t, it's about halfway down the page. Theres also a flywheel and what is supposed to be that boot I spoke of, but it looks wrong.
ETA- I missed the post where you said the boot was okay. Check the muffler screen.
This post was edited by Bret4207 at 14:55:29 01/01/13 3 times.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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