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With the exception of your comment about lean burn and holes in pistons....I fly a Continental IO520 in a Bellanca Viking. In an air cooled engine you can either use fuel to cool it (run rich) or air to cool it (run lean). Air is free, fuel is not. Running at an exhaust gas peak temperature is...

Here's your bullshit dispeller if the day...based on the actual, scientific principles of ethanol, not some made up crap. Yes, ethanol is hygroscopic. Water vapor will come out of the air and attach to the ethanol molecule. If you have a closed system with (say) 100 gallons of (say) pure...

Check air filter as well. Some original Generac branded filter were made in Malaysia and were treated with a fire retardant....so much so that it restricted intake. Just remove and see if it makes a difference. Spark and fuel. That's all it takes. You know you have spark but fuel is...

Not sure about the D140 but the dumbasses at Deere just installed a slant cut pickup line in the tank on some models without any fuel pick up weighted filter. Check there as well. If no filter, I'd install one. A sintered brass filter works nicely....

Check the plug wire. A lot of them are carbon track core meaning there is a carbon coated string in the center. If the cap is mis-crimped on the string over time it becomes unreliable and just stops conducting. Had this issue with a Kawasaki vertical twin. One side was intermittent then just...

Air pressure makes all the difference. And if you have a variable force impact make sure it's set on high. Also: https://bbs.homeshopmachinist.net/forum/general/28095-please-confirm-mw-article-on-penetrating-oil Some thoughts on penetrants for disassembly. And when you reassemble, a dab of...

At least on mine, the indicator decal on the inside started to turn white and then back to black, then white, then black.....may be temperature related but recently has just gone white and stayed there. New fuel indicator units are on the order of $43 and just to see the fuel quantity wasn't...