I had the same problem with my 400. Seemed like it lost spark. Got off the tractor the one time & didn't notice anything funny 'till I got to the carb. There was a bit of frost above the carb on the intake. First thing I did was remove the inline fuel filter installed by the prevous owner. Didn't do it for about 2 weeks. Then it started frosting up again. Quite a bit this time. I did some research & found out there's a heater block for the carb on the 400's. Attached it & have had no problems. FWIW, I did also perform a 12v conversion. I don't know for sure which solution solved the problem, though. It has been running for over a month, flawlessly. Just my $.02 - Mike
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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