Weak spark can mimic fuel problems. Check the spark quality at the plug end of each wire when it acts up. Should have at least 1/4 inch spark to ground. It's probably electronic ignition, but if points, check the condition and gap.
Does the carb have the small screw in fuel filter at the carb?
Those are known to easily clog. If it's there, take it out, try to blow through it. It should blow through easily if it's good. There may be other filters, inline or incorporated in the pump.
Does it have a mechanical fuel pump? If so with the line disconnected from the carb, and directed into a container, crank the engine. It should give strong pulses of fuel, not a dribble. If an electric pump it should give a steady, strong stream, no dribble, drip, or air bubbles.
Could be a bad pump, bad suction hose, look for dry rot, cracked, collapsed. Fuel line exposed long term to ethanol gas can swell and flake from the inside and still look good on the outside.
Weak spark can mimic fuel problems. Check the spark quality at the plug end of each wire when it acts up
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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