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 - 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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