A plugged air filter would cause a rich condition, but when my 4-stroke mower 
has a plugged air filter it does the surging thing.

Max Dillon
Charleston SC


May 13, 2021 8:01:11 PM Mitch Haley via Mercedes <mercedes@okiebenz.com>:

> 4 strokes surge when running lean.
> They stumble lean, the governor open the throttle, they overrev, the governor 
> shuts the throttle, they go lean and stumble again.
> I'd assume 2 strokes are the same, plus if you get unmetered air through 
> leaky crankcase seals, they'll go lean with a perfect carb.
> 
>> I have a Lawn-Boy mower (early 2000's model) still runs well enough but
>> it has developed a "surge" i.e. it will rev up and slow down
>> repeatedly. This is annoying -- likely causes?
>> 
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