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I've got an old jiffy 30 that still cuts 10 inch holes like it was new. This auger has to be pushing 25 years old. Its bounced around back of pickup,snowplane, and pull behinds all its life and I've only rebuilt the carb once, sharpened it, and changed the plug occasionally. Great auger!
+1 My Jiffy 30 10" is 23 years old and all I've ever done to it is file the blade once every couple years. Original spark plug. All I do to "summerize" it is use stabil in the gas, tip it upside down to drain it, and then run it till it quits. The # of holes it has drilled has got to be in the thousands. Still punches them as fast as any I've seen. Starts quick in any weather. The new ones are a lot different, can't speak for them.
I've got 2 Jiffy 30s -- my fishin' buddy died last spring and his widow gave me his. I have had mine for 20 or so years, and my only problem with it is that it starts great cold, but once I shut it off, it may be 20 to 30 minutes before it will fire up again.
Skipper: I've guessed that there might be a "flooding" problem. The screw turns that you reference would be counter-clockwise, right?