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Old 10-19-2020, 02:41 PM   #13
Ak Sourdough
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Join Date: Jul 2014
Location: Fairbanks, Alaska
Posts: 126
Default Re: New engine - intermittent backfiring - stuck valve?

It's lean. Find out why it's not getting enough fuel. Put a pan under the carb and pull the drain plug, then let it flow a couple minutes. I think you'll see it taper off to a trickle.


If an intake valve was not closing, it would puff flame into the intake manifold on every combustion stroke... EVERY combustion stroke. Not just a backfire once in a while. An exhaust valve that isn't closing would burn and you'd have a dead miss.


It's lean.
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