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 - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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