I love how the pull cord falls out when revving lol
That cord is from a predator and it doesn't quite fit that Briggs 9.50 Series. I'm not sure what exactly is different but I had to put washers under the recoil assy housing to keep it from binding up and get it to fit that well so I assume it has something to do with the blower housing. Perhaps it has a proprietary shape just to drive price. If you pay close attention you will notice carburetor blow-by when the engine peaks and starts floating the valves. That's about when the rope starts backing out as well.
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But, I do have a set of 18 pound valve springs stashed around here somewhere...I might install those in there but that's about as far as I am willing to go with a stock engine without tossing that crappy cast flywheel and to be honest I should replace the thing anyway.