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Discussion Starter #1
I've got a 6.75 HP Briggs that will not run smooth. It revs up and down constantly. I discovered today that it will run perfect without the air filter. I've cleaned out the air filter but that didn't help. The mower is almost new. It's only been used about 10 times. It ran really good until the last time I used it. Any ideas??
 

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Model and code numbers would tell for sure, but if you have an internally vented carburetor, then a dirty air filter will cause a problem like you describe. Replace the air filter as oscaryu1 suggested, if that does not take care of your problem then look to the carburetor for additional service.
 

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Discussion Starter #6
I replaced the air filter and the thing runs perfect again. I couldn't believe the filter was clogged because it's not very old at all. Thanks for the help!!
 
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