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Model #20371 FWD with Kohler 6.75 cc starts first time every time, but when I stop for a 15-30 minute break (it's a big yard) the mower won't start back up. I clean the spark plug, open the gas cap, but nothing works. An hour to 90 minutes later it starts right up again on first try. Theories...

After about 10-15 minutes, the engine starts to struggle, as if it's starting to run out of fuel. Thanks to a suggestion in a post I read on this forum last year, I now reach down and open the fuel cap, allowing air into the fuel tank, and the engine revs back up to normal. I have to do this...