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LAURA RINARD

Why would my Craftsman lawnmower make a pop sound and then not start?

by LAURA RINARD
August 3rd, 2009

My Craftsman push mower, model 917.377301, will not start after making a popping sound. I changed the spark plug and cleaned the air filter, the oil was low so I filled that; it seems like it should start.

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Craftsman , Lawn Mowers , Lawn & Garden
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3 Answers from these members:
Manage My Life
The flywheel key might have sheared on the engine. Something internally might have broken inside the engine.

To check the flywheel key, remove the cover on top of the engine (blower housing). The blower housing covers the entire upper portion of the engine. It is held on by 4-5 small bolts around the lower edges. Remove the bolts and lift the blower housing off the engine.

Remove the cup on top of the engine the starter engages to and look at the hole in the center of the flywheel. There is a groove in the engine shaft and a corresponding groove in the flywheel. If these 2 grooves are not perfectly aligned, the key is sheared.

You have to remove the flywheel to replace the key. You will need a special tool to remove the flywheel. The part number of the flywheel puller is 42-074.
by Manage My Life
August 3rd, 2009
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