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Last winter met with some 6X6ers in WY for some snow fun. Unloaded an my machine was running really bad. Tim (Obsessed) tossed a tiny bit of snow on the exhaust pipes and showed that the back cylinder wasn't running. He checked the spark plug wire. I put my hand down in to follow the circuit just to see what was down there and all of a sudden it started working again. It hadn't faltered like this before and hasn't since. When I got home I tried to get it to do it again. No joy.
Forward to today. I thought I would try again and see if I could get it to fail. Started it and during idle pulled the plug wire off each cylinder. There is definitely a larger RPM drop when the back cylinder is unplugged compared to the front cylinder. Thought it might be valve lash and adjusted that. Didn't fix it.