The reason I say battery ignition makes for a smoother running engine at other than full throttle is because with a magneto, as used on these models, the spark advance is full at all running speeds. Only retarded with a impulse for starting. Listen to all those little pops in the exhaust at low rpm on magneto equipped engines. Hear that flap on the muffler slapping back and forth. That is due to improper advance for that speed. I am not talking about pulling tractors as I have no interest in them. I am talking about customers tractors brought into shop for repairs in the years I worked at dealer. Talked more than a few into getting rid of the magneto over the years. Very few if any old tractors are running with their original bore, compression ratio's etc. So , they are all modified to some extent.
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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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