It almost sounds like you're not getting enough fuel in the bowl to keep it running. If the float level is way too low or flow is way too slow, you'll only get it to idle. Usually, it will try to spit back through the carb when you try to throttle it up. If the main passage is plugged, the symtoms will be about the same. Running for only 10 seconds or so sounds like it is only running on what you get by choking it to start. If your tank is almost empty, it will fill the glass bowl under the tank,but not the float bowl.
This post was edited by arnold z at 05:18:36 09/30/13.
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