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Engine Sputters/Misses after Warming Up

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Still having trouble with the 10 hp Briggs in my 3110. Rebuilt the carb- went thru it twice rechecking everything. Begins to sputter and miss after it warms up- about 10 to 15 minutes. Will not adjust out with the high speed and idle adjustments- I think it’s something beyond the carb. I’ve installed a new plug and new coil (electronic ignition) - not much more I can do there. Flywheel key in good shape. I plan next to pull the head, check valve seats, springs, etc. Any other suggestions before I dig deeper? Thanks for any input.

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PatRarick
I would replace the condenser first. If the problem persists, I would check the coil. Get an in-line spark tester and observe the spark when the problem begins. Pat

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