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Murray Push Mower Won't Crank?

I have a Murray 21" push mower with a Briggs & Stratton engine, model year 2015. I've been using it fine for over a year. I keep it maintained: make sure the carb is cleaned, oil checks, nonethanol gas, etc.

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I mow my grass every 2 weeks, aside from winter months, of course. Last time I cut my grass, it cut fine. Normally it takes 2 tanks to mow my lawn. I filled my tank the 2nd time to finish up and it won't crank. So, I figure I'd wait until next time, since, I didn't really have, but a couple of passes in the backyard.

Now, two weeks later, it still won't crank. I've taken apart the carb and detail cleaned it and checked it for any cracks or breaks. I know the gas is getting into it, because, I poured out gas when I took it apart. I've replaced the already fine gas with brand new gas, again, I use nonethanol anyway.
I've checked the spark plug, cleaned it off, it's fine. Checked the blade, cleaned it. Checked the oil, it's at a really good level. The pull string is at a fine tension, same as it was when I bought it. It tries to turn over, but just doesn't.

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Gold Post Medal for All Time! 677 Posts
June 16, 20171 found this helpful

From doityourself.com:
1. Is the flywheel magnet rusty? I have had to clean that sometimes to get a good spark to the magneto.

2. Have you changed the condenser? Take the flywheel off, it is usually under a small light weight metal cover. Go ahead and change the points also.

3. If it is getting spark, check the flywheel alighnment key way. If it has been sheared or out of place even slightly, the timing will be off and it will never crank.

4. Another problem I have had with the old type Briggs engine is: For some reason, the carburetor butterfly won't open when cranking. Choke the engine, then if it won't crank, take the air breather off and stick a screwdriver in the carbutetor to hold the butterfly open. After it cranks, you can put the breather back on.

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Gold Feedback Medal for All Time! 949 Feedbacks
June 17, 20170 found this helpful

I am not familiar with starting a lawn mower but my son says to try spraying with a carburetor cleaner before going to a bigger item.
I know you have probably been through many check lists but maybe there might be just one item you missed??

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Here is a good site that addresses this same problem but seems to be more detailed.

www.repairclinic.com/.../Lawn-mower-won-t-start

www.familyhandyman.com/.../view-all

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