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Momg: I've been around these little offsets for 50 years, and I have operator's manuals and service manuals for each of my SA, 130 and 140, and I've yet to see a recomendation for 93 octain gas. In fact they will run well on lower than 87, but that is as low as we have today. As far as the lead substitute goes that is a bunch of hogwash. Lead was only ever necessary for high performance, high rpm engines, your 140 is neither. I'm not familiar with those AL numbers, however those tractors all came from the factory with Champion D-16. The only reason to go with a hotter plug would be if the tractor is not regularly worked hard. I still run my D-16 with a gap setting of .023. Everytime I encounter other owners and tractors, they always ask how I get the power I'm getting and have them running so smooth. I tell them as I'm telling you, just maybe IH had it right. By the way, my SA is 6 volt, 130 and 140 are 12 volt. Believe me I do work these little tractors quite hard. I have a Woods mower on my SA. I have a 2x12 plow, a 24 blade disk and 17 shank Stine cultivator. Statistics will tell you these each require more horse power than I have in the 130 or 140. I do ocasionally run out of traction, but I never run out of power to pull any of those 3 implements. I have farmed with tractors as large a 150 HP, and my ratio of speed, per HP, per plow bottom or disk blade or cultivator shank is just as high, maybe a bit higher with 130 or 140 than those big tractors were. That my friend is my judgement call on whether my tractors are working well. I have a neighbor with 200 hp and a 160 shank Stine cultivator, roughly same ratio of hp to shanks as I have. When I can follow him down the field, I know my tractor is working well, when he doesn't keep up my tractor is working exceptionally well. These little tractors are not that complicated, just some folks make them complicated. I once was working my 130 alongside a 90 hp FordNH. Both tractors quit, mechanical problems. A trip to the parts bin and I was going in less than 3 hours. His 5 year old tractor was picked up by NH dealer, came home a week later with a bill attached equal to 16% of what he paid new for the tractor. I rest my case.
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