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Discussion Starter · #1 ·
Have a kohler 17.5 ohv run rough and muffler get glowing red after a few minutes any suggestion on what it might be
 

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Hi there,

The first place that I would check would be the muffler itself. I would pull it off and see if I could tell if the muffler was clogged or has some sort of obstruction inside blocking the exhaust flow.
 

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first thing i would do is pull the plugs (i belive it's a twin) and seeif the porcelain insulating tip has a rusty looking glaze. it sounds as if it is running with a lean mixture.
 

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Discussion Starter · #4 ·
It a single and the muffler is brand new thought maybe it might be a valve problem i dont know pull off mower and replaced motor just wondering if i should mess with the motor. has 364 hrs on it
 
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