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Old 06-05-2009, 12:43 AM posted to uk.rec.gardening
Dave Liquorice[_2_] Dave Liquorice[_2_] is offline
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First recorded activity by GardenBanter: Feb 2008
Posts: 758
Default Briggs & Stratton engine not running smoothly

On Tue, 5 May 2009 22:58:23 +0100, Bob Hobden wrote:

sometimes a knackered fuel pump but mowers don't have those.


Mine does. Manifold depression sucks a diaphram against a spring and that
movement (one way or the other) lifts fuel from the tank into a chamber
below the carburetor. There are a couple of flap valves as well, one of
those stuck open gave me the hunting problems.

Make sure the float moves easily and that there is no muck in the float
chamber.


No float but grud in the chambers or jets is a possibilty. No choke
either, cold start is aided by simply pressing the prime button 3 times
which squirts extra fuel into the inlet manifold. These single cyclinder,
small, air cooled 4 stroke engines don't need a choke like a 4 cylinder
water cooled car engine does. Once they have run for a few tens of seconds
they are warm enough not to require it.

--
Cheers
Dave.