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Have Briggs17.5hp intek 31G777 Eng on mower,have replaced f/wheel key,valves,coil,checked carby still it back fires thru carby,timing seems ok.What else can I do to make it run instead of backfire.

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The valves are not set correctly. or the valve seat is out of its seat.

Posted on Apr 24, 2017

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1 Answer

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has motor got compression are valves still opening is plug getting wet with fuel, have you changed plug, sounds like you have checked fly wheel key hasn't sheared

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Hello,
My name is Dane and I am going to help you solve your problem.
Normally, when an engine backfires through the carburetor, It will be from a valve problem. You should first adjust the valve clearance looking also for any bent valves or pushrods.
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I hope I've helped! Thank you! Dane

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Hi just got a 13.5 briggs do i have to power up the grey wire from the carby cheers john


Yes. It should get power when you turn the key to run, this lets fuel into the carby. When you turn the key to 'off ', it cuts the fuel off. The black wire in the same plug (on the other side of the engine near the starter motor) goes to the coil and is the engine kill wire which is connected to the ignition key switch and gets earthed out when you turn the key to 'off '. Dont make the same mistake I made and have it connected to earth all the time, the engine wont go at all! Aussie Steve.

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17.5 briggs intek backfiring thru carb wont start have adjusted valves?


Easy things to check, flywheel key, make sure it is not broken, check the coil gap to the flywheel. could be the coil is not advancing. Check, if it has one, the oil sensor by unplugging it. hope this helps.

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1 Answer

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After you check the key and key way,Check the coil wire to see if it has any breaks in it,If no breaks are present,Replace the coil.

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