Craftsman Riding Mower- started backfiring today - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 10 (permalink) Old 06-22-2019, 07:20 PM Thread Starter
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Craftsman Riding Mower- started backfiring today

Have a Craftsman 917.203901 with a Platinum 22 HP that is about 3-4 years old. I mowed the yard today, and as i when pulling into the garage it started backfiring. At least that what it sound like, coming from the front of the mower. It did it consistently when moving forward and less so when moving backwards. It was loud enough that my wife came outside because she heard it in the house. I'm not a small engine expert by any means, so I'm looking for some answers, advise, or a place to start.

Thanks in advance.
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post #2 of 10 (permalink) Old 06-23-2019, 11:26 AM
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maybe a valve sticking, or a flywheel key sheared just a slight bit putting it out of time just slightly
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post #3 of 10 (permalink) Old 06-23-2019, 02:44 PM
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Welcome to MLF RoadGypsy. Could possibly be water in the gas or failing ignition coil or be a valve acting up as cranman said.

Experience is something you don't get until just after you need it.
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post #4 of 10 (permalink) Old 06-24-2019, 04:53 PM
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could be trash got in carb causing flooding and backfiring

better go see if it starts and is still doing it as this may take a few days to figure out so its ready to cut grass again

my first step if its still acting up is would be pull carb and clean float seat, if that doesnt do it then check flywheel key and valves adjustment

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post #5 of 10 (permalink) Old 06-24-2019, 09:40 PM
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I hope it isn't the cam shaft. Actual engine work starts at the 3 minute mark.



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post #6 of 10 (permalink) Old 06-25-2019, 11:54 AM
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The other thing with those Briggs is heat. If the shroud has never been taking off and the fins blown clear, they will run hot (usually the right side). When they do all kinds of problems can happen in the head including the valve stem guide backing out. Valve can't move correctly, pushrods get bent, timing of intake/ exhaust is off........
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post #7 of 10 (permalink) Old 06-25-2019, 08:20 PM
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Sears parts direct cannot find that model number ?
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post #8 of 10 (permalink) Old 07-02-2019, 06:00 PM
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Quote:
Originally Posted by suspicionofignorance View Post
Sears parts direct cannot find that model number ?
Here is a link to the Sears Parts Direct page for this machine.
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post #9 of 10 (permalink) Old 07-02-2019, 09:07 PM
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post #10 of 10 (permalink) Old Yesterday, 09:31 PM
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Quote:
Originally Posted by suspicionofignorance View Post
??????
put your mouse arrow on his reply and click to go to the parts page for it

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