I have a 41 9n that I took out tonight for snow plowing. When I first went to start it it wouldn't go. So since I knew there had been a little mixed two-stroke fuel in the tank when I ran out and had to get it into the garage a while ago, I figured I just needed to clean the plugs. I decided to stick the charger on the battery first and leave it on while I was cleaning the plugs So i pulled the first plug, cleaned it up and before i stuck it back into the head, I plugged it into the wire and rested it on the manifold, and then cranked the engine over while watching the plug for spark. The thing hadn't cranked for 2 seconds and it fired right up running on 3 cylinders, no choke or anything. So i shut it off put the spark plug back in and took off the charger, started her up again and went and did some snow plowing.after that, I shut it off, went in for supper and came out again after. It wouldn't start no matter what i did - cleaned all the plugs, the cap and rotor, all the sparks were big and blue, I tried ether, block heater, and nothing worked. What is going on?
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