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Discussion Starter · #1 ·
Good day!

My neighbour brought over an older model Craftsman push mower wanting me to have a look at it. The mower seems to not be firing at all. The mower blade was severely bent and twisted indicating a heavy debris strike.

I then examined the flywheel and key and found that although the key did not shear, the flywheel was cracked slightly and had slid out of firing timing by about 2 or 3 degrees at the most.

I know that the flywheel being out of time will cause a 'no-start' condition on a lawn mower, however I would like to ask if such a small margin of timing error of only a couple of degrees would cause a complete no-start.

I don't want to spend a wad of money on replacing the cracked flywheel if it turns out to be something else that needs replacing in order to get this mower running again.

Any help or advice reference this issue would be most sincerely appreciated. Many thanks...
 

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Hello, I would think it would at least pop that close. You may have more damage. Have you verified piston movement?
 

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Discussion Starter · #5 ·
Have you verified piston movement?
The piston indeed does move when I rotate the blade by hand. I'm thinking of reinstalling the flywheel (in-time) and try starting the mower again.

I dunno. Would you guys recommend reusing a flywheel that's been cracked like that???
 

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That flywheel needs to be replaced as it is not safe to use.
 

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some mower shops even have there own little salvage yard out back for them to hoard mostly obsolete or valuable parts. one might have what you need back there
 

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Discussion Starter · #8 ·
Thanks guys for all the help and replies. It is most appreciated!

I priced out a new flywheel but that's just not economically feasible so I'm keeping an eye out for a junker mower that I can rob parts off of. There's more wrong with this machine than just a cracked flywheel anyway. I suspect that a failed coil is the most likely reason for the 'no-start' condition so that will also need replacing.

Again, many thanks...
 
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