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    Engine popping

    I was given a troy built mower with 17.5 b&s engine. Mower shut off while in use (this is why I got it). I found the intake valve gap was about 1/4 of a inch. Adjusted it to .06 and tried to start, will not start--buts popping out of carb and exhaust while cranking. fuels looks and smells good...
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