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Originally Posted by Bryan Howell
Pulled two plugs to check spark, weak but a spark. Also tried the coil wire, a bit better but still not what I would expect.
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OK, we have spark. Maybe not great spark but spark.
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Fuel pump is pumping fuel, disconnected fuel line into carb and caught fuel being pumped out of fuel pump.
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Fuel
delivery is confirmed.
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The carb has maybe 3 hours on it since I completely cleaned it, and it is brand new anyway.
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This is not evidence. Give a brand new carb rancid fuel and you're right back where you started.
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I would expect if it was fuel related some missing, sputtering, etc right before it died, not a clean now it is on, now it is off deal like I had. Something so abrupt is, in my experience, usually ignition related.
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We have no real evidence it is ignition related other than your expectations and what you think it usually is. That is not evidence and therefore not troubleshooting.
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Sadly ignition is kind of my weak spot as a mechanic.
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Don't be intimidated. This forum knows ignition dead bang so no worries. The same troubleshooting principles apply to ignition as anything else but at this time we are not directed there. We may be later, just not right now based on what is KNOWN.
Given what we KNOW (spark and fuel delivery confirmed), this suggests a carburetor issue. I recommend a full carburetor disassembly and clean up paying attention to all components as long as it's open such as choke plate fully closing, all ports rooted out, float level check, debris in the float chamber, float valve not stuck closed, etc. I would also draw off a cup or two of fuel downstream of the pump, put it in a glass container and look for debris, water and/or phase separation. Make it as good as it can be, reassemble and try to start.