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I have a craftsman DGS -6500 that seems to stop running after 40-50 minutes of use like it is over heated. I let it cool down and starts back up. I keep the oil changed regularly and have replaced the air filter but continues to have problems. Any advice? Thanks.
 

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So your air-cooled engine is running hot? How do you know?

1st thing I'd check is to be sure the cooling fins & passages are clean and free of grass and cloggage.

Next- Check/pull the plugs and read them. It will give you an indication of what is happening inside the engine.

Just a few ideas for ya..:fing32:
 

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Check for spark when cold for a reference.
Check when problem occurs and compare.
Sometimes, coils get heat sensitive.
 

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First thing I'd check is the air flow around the engine. I have had field mice build nests in the air channels on my 18 HP B&S flat head twin. I first noticed this when I was mowing on a hot day and saw smoke coming from the engine. I stopped and turned the engine off, the fire went out on its own, it was nesting material.
 
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