You indicate that it is a pulling tractor, that kind of changes a lot of things. It may be pretty high compression, timing, who knows where it is set at, no doubt for maximum power under pulling conditions. Far as the spark advance, that occurs with engine rpm and totally dependent on how distributor is calibrated. In other words, it will advance the spark as engine rpm increases and retard as it decreases and has nothing to do with the throttle setting when engine is not running. I fought 6 volt starting systems for years. The last really hard starting gasoline engine IH made was the first 450 gas tractors. About half way through production they switched to 12 volt systems and problem solved. Many M's are on 12 volts now and most stayed with the 6 volt starter and it works out quite well. One thing, they do not have the initial torque to get that engine started turning, but once it turns just a little, they spin it like heck. Being a six volt starter it has much lower resistance so will really draw a heavy current for a few seconds until it gets it turning. This is normally not a problem but with a higher comp engine and cold thick oil it may very well be a problem. You may want to get that starter converted to 12 volts also if it is not. Far as solenoids, well, if you can get a really heavy one it is good, but most of them are no heavier in the contacts than the original push switch, just that they slap the contacts together good and hard. You of course need good clean, heavy connections all the way through and ground the battery right on starter mounting bolt for best results.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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