I have a lawn mower with a briggs and Straton vertical shaft I/C motor (model #280707) that keeps backfiring out the exhaust and carburetor. Looking at the troubleshooting guides online it looks like I probably sheared the flywheel key. I would like to fix this and am wondering how hard it is to fix (how long should it take), what tools I will probably need and any parts I might need. A simple proceedure would be helpful as well if available.
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