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16 hp Briggs. runs uneven will not idle. changed spark plug and clean carb. get pops out of muffler. any suggestions on where to check next?

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Check the flywheel key. If you did not use the soak carb cleaner to clean carb i would get some and clean it again.

Posted on Jan 08, 2010


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I got a poulan po1742stb riding mower with a 17 hp briggs n stratton engine it was my dads and it hadnt cranked since he died which was bout 2 years ago so i had to replace the ignition coil and my wiring...

Thanks for stopping by...
When you said "cleaned the carb" - did you disassemble, and clean - or just spray carb cleaner into it?

Sitting for 2 years - the additives in the gasoline can leave a varnish that will clog the tiny jet orifice in the carb bowl.

You'll need to disassemble, and clean out the jet with a wire.

Popping and sputtering can be caused by a few things:

Old Gas - drain and refill with fresh.
Dirty Air Filter - Check and clean/replace it.
Poor Fuel mix/ratio - clogged Carb Jet or sticky butterfly.
Poor Spark - check/change the plug.
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Clogged Fuel Filter/inlet screen - backflush the tank and the debris should wash back into the tank. Rinse out and re-install.

This is most likely a fuel delivery or spark issue.

Change the fuel and plug first... and give the carb a GOOD cleaning... then re-check.


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If this engine has been sitting for awhile I would guess the carb. is gummed up and need a good cleaning. First thing I would do is try a fresh spark plug. Just because the plug looks good doesn't mean it is. If you have a fuel filter check this also. If it is getting fuel into the carb and has spark and compression I would remove the carb and clean it.

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