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 :
> 4 strokes surge when running lean.
> They stumble lean, the governor open the
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
Clogged carburetor, or clogged exhaust ports. Maintenance on those requires
cleaning the exhaust ports every 25 hours.
Rick
From: mercedes@okiebenz.com
Sent: May 7, 2021 6:33 PM
To: mercedes@okiebenz.com
Reply-to: mercedes@okiebenz.com
Cc: astr...@indiana.edu
Subject: [MBZ] OT: small two
Usual cause is a sticky governor, not sure how it works on a Lawnboy though.
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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?
Allan
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