Tecumseh HH100 Handbook page 13

Do not remove the main nozzle. If it is necessary to
remove the main nozzle to aid in cleaning, discard
the main nozzle and use a service replacement nozzle
with an under cut in the thread area. If the nozzle
removed is under cut it can be reused. This procedure
must be followed to assure delivery of fuel to the
idle system.
UNDERCUT
ANNULAR
GROOVE
SERVICE
MAIN NOZZLE
(REUSABLE)
Float settings are measured opposite the float hinge.
Remove float by pulling out float axle. Bend adjusting
tab to correct setting. Always remove the float to
make adjustments.
Examine the float hinge and axle for wear. If evident
replace the parts.
FLOAT
FLOAT
SETTING
ADJUSTING
TAB
ORIGINAL
MAIN NOZZLE
DO NOT REUSE IF REMOVED
FLOAT HINGE
AND AXLE
INLET NEEDLE
AND SEAT
EARLY
This shows early and new needle valve, seat, gasket,
and spring assembly for large horsepower engine
carburetors.
Early carburetors have a metal-to-metal needle and
seat contact. The float setting for this model will be
.110'' - .130'' (2.794 - 3.362 mm).
New carburetors contain a viton seal in the seat and
a spring on the needle. For engines with the new
carburetor and having a fuel pump, the float setting
is .140 (3.556 mm).
For engines with the new carburetor, without a fuel
pump, the float setting is .075 (1.905 mm).
The float setting on carburetors used on vertical 8
and 10 H.P. engines is .070'' to .110'' (1.778 - 2.794
mm). No variance for carburetor having a fuel pump.
The gasket must fit over the float spring as shown
to avoid cutting by the spring when assembled.
NEW
GASKET GOES
OVER SPRING
(IF EQUIPPED)
CHOKE END OF
CARBURETOR
ENDS OF SPRING
POINT TOWARD CHOKE
END OF CARBURETOR
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