I have 15 propane tractors from mta thru 856.all have different starting chsracteristics. Dad was in LP business in the 60" 70s. we always start on liquid even our 560 that sits out and starts every day to feed cattle even at 25 below. most start the best with 1/4 throttle and choke pulled all the way. if it is trying to run while cranking starter but quits as soon as you stop. I would be inclined to check electronics further.I am not familiar with a mag but on my M I have a jumper wire from the battery to the coil I clip on to start then remove after it starts. It doesn"t get enough voltage during cranking.good luck
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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