JohnT, Yes leaning out a carb causes an increase in temp up to about 15:1. Going past that point, the exhaust temp will decrease. I just put a temp gauge on my exhaust and temp will decrease so will horsepower. So find a point past 15:1 and it will run cooler. Going to far, when governer opens engine will stumble. Find a happy mix stop making carbon deposits.
In my case, in the winter, I need to richen up carb 2 1/2 turns. Cold winter air and winter blend gas.
Same is true with old carb airplanes. I've seen done on an airplane and I've done it with my Jubilee.
Too rich mix, causes carbon build up in combustion chamber, causes increase in compression ratio, hot carbon acts like a glow plug.
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Today's Featured Article - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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