Today is the first I used IH C to mow with after turning the main jet out another 1/4 turn. It takes about 40 minutes to mow yard. Tractor was up to normal operating temp, 135 degrees. The boss was using it today. When she turned the tractor off, the throttle was in the middle position, more than a fast idle. I was expecting a little dieseling. Nothing, engine stopped like it should.
I think this is proof that a LITTLE lean of peak temps in THE COMBUSTION CHAMBER are cooler. Going way past lean of peak, from what I've read, will cause detionation, pinning, and do damage to pistons and valves.
I'm happy with my experiment, well worth the $22 for an exhaust temp meter. Bet the gas savings will pay for it really fast.
Now I need a way to lean out the 20 hp kohler, which and no carb adjustments.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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