Backfiring, no starts, pull cord snapping back violently and oil leaks are all signs that your shear-key is damaged. If you’ve had a blade strike, then it’s very likely you need to watch this video. The good news is a shear-key only cost a few dollars.
Before working on your mower be sure to remove the plug wire to prevent accidental starting, see “Repair Safety Video”.
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John Cunningham is an Automotive Technician and writer at Lawnmowerfixed.com.
He’s been a mechanic for over twenty-five years and shares his know-how and hands-on experience in our DIY repair guides.
Johns’s fluff-free How-to guides help homeowners fix lawnmowers, tractor mowers, chainsaws, leaf blowers, power washers, generators, snow blowers, and more.