Stihl SH 85C Loses Power

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Old 11-21-11, 09:25 AM
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Stihl SH 85C Loses Power

I have a four-year-old Stihl SH 85C blower that has developed a problem the last three times I have used it. After running at full power for about 10 minutes, the engine speed slowly decreases until it barely runs. If I shut it down and let it cool off for about 5-10 minutes, it starts right up and will run fine for another 10 minutes or so until the problem repeats.

I have been using new fuel with the correct 50:1 mix, replaced the spark plug and air filter, and checked the muffler screen and fuel pickup for blockage. Everything seems normal, so I am wondering what could be causing this. Like I said, it runs perfectly for about 10 minutes and then starts to die for no apparent reason.

Thank you.
 
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Old 11-21-11, 06:14 PM
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Next time it starts to die out, try loosening the gas cap. If the tank vent isn't letting air in to displace the volume of fuel used, it will develop a vacuum in the tank and keep it from running well.
 
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