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Although Dell's advice may be correct (heck, its pretty much always correct), I would like to relate an experience I had when I first got my 2N. I was bush-hogging with it and the motor started to sputter, much like it was running out of gas. I pulled the choke out a little and it evened out and ran like before, so I kept cutting. However, the longer I cut, the more choke I had to apply to keep it running. Finally it just quit, and backfired. Lots of gas in the tank and there it sat. Luckily I had found this message board and soeone sugested exactly what you did, adjust the carb. I did as they instructed and it worked - she started and ran, for about 20 minutes and then the choke came back out. After readjusting and readjusting, I looked a little closer at the carb abd noticed that the head of the screw was not in the position that I had left it in. Turns out that the vibrations from the engine running was backing the screw down, and starving the engine of gas. On my carb, the main screw is held in place by a bent metal tab that rests against the ribbed screw head. The tab was no longer making contact and the screw could go wherever it wanted. I removed the metal tab (two screws) and bent it a little farther into position until it rested on the ribbed screw head. I haven't had to adjust the screw since (10 months) - knock on wood.
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