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In the -20 I always had a warm tank for it. However the clutch wouldn't disengage in the sub zero temps. The elastic band that holds the bit on is a joke in cold weather. Try putting the extension on in the cold. We all know what happens to rubber when it gets cold. It wouldn't start on a 20 degree day one time. Changed tanks and plug still wouldn't start. Blades were fill after two tanks and never hit anything. And it weighs a ton. Throttle cable stuck too because the return spring is too light. My buddies 4 leaked oil out of the base also. He only used it twice. If I didn't know Jiffy was here in WI. I'd swear these things were made in Florida. I'm back to my old two strike laser.
I picked up a Jiffy Stealth 3hp 10" for $75. Its in fantastic shape. Has been sitting for years though, needs a carb kit ($10) and im also replacing the head gasket for the heck of it ($3).. i called the vin # in to jiffy its a 2004 model. One of the last years of Tecumseh engines. Im pretty stoked. This will replace my junk Jiffy Pro 4.
If it was like -5 or warmer it would work okay.