Jiffy Augers Tune up tips?

[Minnetonka]

I have a Jiffy Legend Ice Auger that runs great when I first fire it up. After I drill a few holes in seems to stall out and then is harder to start then it was when it was cold. I suspect that I need to adjust the gas mixture. I know that the two screws adjust the fuel mixture and the idle. Does anyone have some advice as the best way to tweak these settings? Also, how often do people change the plugs? Mine are three years old. I am guessing I should throw a new one in there.

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[Surface Tension]

Start with new plugs. Heres a link for ya.
Good luck.

http://fishingminnesota.com/ubb/Forum9/HTML/001584.html

[Minnetonka]

Thanks ST.

I will follow your advise and get a new plug.