FUEL SYSTEM/CARBURETION
4.12
NEEDLE AND SEAT
LEAKAGE
TEST
1. Install the float bowl. Invert the carburetor and
install a Mity-Vact (PN 2870975) to the fuelinlet
fitting. Apply 5 PSI pressure to inlet fitting. The
needleandseat shouldhold pressureindefinitely.
If not, inspect needle and seat and seat O-ring.
Mity Vact (PN 2870975)
PILOT SCREW
Thepilotsystemsupplies fuelduringengineoperation
with the throttle valve closed or slightly opened. The
fuel/air mixture is metered by pilot screw and
dischargedinto themain bore throughthe pilot outlet.
CAUTION:
The pil otscrew iscalibr at edatthefactor yto meet EPA /CARB
regul at ions for air qualit y standards and is sealed with a brass
plug t o pr event tamper i ng. Removal of the tamper proof plug
is not permi t ted. For ser vi ce purposes, cl eani ng of the pilot
cir cui tcan be done only by a certified repairshop to ensure air
quali t y standards are not exceeded.
Pilot Screw location
Brass Plug Installed
Brass Plug Removed
FUEL LEVEL
A fuel level test can be performed on some models if
the drain hose fitting is accessible. Be sure to
re-attach the bowl drain hose after performing the
test. A fuellevel test allows you toobservethe height
of the fuel in the float bowl without removing the
carburetor. The fuel level can be observed with the
engine either running or shut off, however, engine
must run briefly to allow fuel level to stabilize..
1. Attach a clear line to drain fitting. Besure line fits
tightly on fitting. Position hose along side of
carburetor as shown.
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