Service Manual

25
CARBURETOR
13. Install the air vane and throttle shaft into the
carburetor body by very carefully pushin
g
the shaft
throu
g
h the collar into the carburetor body. (See
Fi
g
ure 37.)
14. Push the throttle plate into the throttle shaft. (The
plate only inserts one way.) If the throttle plate
does not fit snu
g
ly, replace the throttle shaft. The
g
overnor sprin
g
can now be attached to the throttle
shaft.
Note: Be sure air vane operates smoothly and
does not stick or bind.
Installation
1. DuraForce - Assemble the carburetor,
g
askets,
heat shield, and air filter box. Use the two
mountin
g
screws to hold the parts to
g
ether durin
g
assembly.
R tek - Assemble the carburetor, spit cup, heat
shield, and
g
askets. Use the mountin
g
screws to
hold parts to
g
ether durin
g
assembly.
2. DuraForce en
g
ines - Guide the air vane throu
g
h
the openin
g
in the shroud base from the bottom of
the base, and attach the carburetor to the en
g
ine
with two mountin
g
screws. Ti
g
hten them to
specifications.
3. DuraForce en
g
ines - Insert the bent wire of the
throttle cable into the vertical tab of the speed
control lever. Set the throttle to fast and the speed
control lever so that the throttle plate is in the full
open position. The cable is adjusted at the cable
clamp on top of the air filter box.
R tek en
g
ines - Connect the
g
overnor sprin
g
to the
throttle plate and the tab on the block. Connect the
g
overnor rod adjustin
g
loop (A) up to the air vane,
and connect the choke cable. Assure the throttle is
in the full open position. (See Fi
g
ure 38 and Fi
g
ure
40.)
Fi
g
ure 38
724-004
4. Install the fuel line and primer tube on the
appropriate carburetor fittin
g
s.
5. Check that the choke and air vane assembly move
freely and is properly adjusted. If the air vane
requires adjustin
g
, see Presettin
g
the Governor on
pa
g
e 26.
6. Install the air filter element and cover (DuraForce
en
g
ines only). The R tek en
g
ine has a spit cup (B)
only. Note: The openin
g
of the spit cup should be
pointed up. (See Fi
g
ure 38.)
Governor Theory
Reed Valve Engine
(DuraForce Engines Only)
The shaft of the
g
overnor air vane is attached to the
throttle disc of the carburetor so that air flow, created
by the rotatin
g
flywheel, attempts to close the throttle.
The
g
overnor sprin
g
resists this force and attempts to
open the throttle. The balance between these two
forces is the
g
overned en
g
ine speed. Sprin
g
tension
may be chan
g
ed via an adjustable collar which
produces a 50 - 75 RPM chan
g
e in en
g
ine speed for
each adjustment “click” it is moved. (See Fi
g
ure 39.)
A
B