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I give up, ignition coil installed and it only want 8 minutes. If it needs a valve adjustment I'll have to take it on somewhere and after that money and all the parts I've put into it I might as well just get a new one. I'll sell this one to someone that knows how to fix it or wants it for...

Just got a new ignition coil today. I'll post after I install it and try again. Here's hoping it works.

Okay, so new gas cap didn't change anything. Mowed for 10 minutes then sputtered and died. Is the ignition coil my last option?

It sputters for a few seconds then dies.

Thank you I will try this on my next mowing attempt.

Hi, I have a MTD 21" self-propelled 139cc OHV push mower. It runs strong for 10 minutes or so then stops. If I wait 15-30 minutes I can usually get the last 10 minutes of mowing done. I have such a small yard and this is really frustrating. I have replaced the spark plug, changed the oil, air...