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SERVICE AND
, .................
u
TO ADJUST CARBURETOR (See Fig. 28)
The carburetor has been preset at the factory and adiusl-
ment should not be necessary.
However,
minor adjust-
ment may be required to compensate
for differences in fuel,
temperature,
attitude or toad, If the carburetor does need
adjustment,
proceed as fotlows:
in general
lurnfng
idte mixture valve in (clockwise)
de-
creases the supply of lucite
the eng neg ring a teanar fueV
air mixture.
Turning the idle mixture vatve out (counter-
clockwise) increases the supply of fuel to the engine giving
a richer fuel/air mixture
IMPORTANT:
DAMAGE TO THE NEEDLE VALVE
AND
THE SEAT IN CARBURETOR
MAY RESULT IF SCREW IS
TURNED tN TOO TIGHT
PRELIMINARY
SETTING
-
,,
Air dearer
assembly must be assembled Io the carbu-
retor when making carburetor
adjustments.
,'
Be sure the throttle control cab{e is adjusted properly
(see above).
•
With engine off turn idle mixlure valve in (c_ockwise)
closing it finger tight and then turn out (counterc!ock-
..........
wise)- 1-fUtl turn
FINAL SETTING
o
•
Start e ng n e and allow to warm to r five minutes.
Make
f hal adjustments
with engine running and shttVmotten
contro! layer in neutral (N) position.
.
Move throttle control lever to slow (,.ram)position
W{lh
f nger rotate and herd throttle lever against idle speed
screw. Turn
die speed screw to attain 1750 RPM
,
While s_tfl holding
throttle
lever against
Idle speed
screw, turn d e mixture valve in (clockwise) until en-
g ne begins to die and then turn out (counterclockwise)
unfit engine runs rough. Turn va ve to apo nt m dway
between those two positions
Release throttle _ever.
ADJUSTMENTS
, ,,
i,
,U,,U,,,llLLL lll, I Ul
ACCELERATION
TEST -
•
Move throttle control lever from slow (,_)
to fast ('r_,)
posit_on, if engine hesitates or dies, turn td_e mtxture
valve out (counterclockwise)
1t8 turn, Repeat test and
continue to adjust, tf necessary,
until engine acceler-
ates smoothly.
High speed slop is factory
_djusted
Do not sdiust *
damage may resutt.
IMPORTANT:
NEVER TAMPER
WITH THE ENGtNE
GOVERNOR,
WHICH IS FACTORY SET FOR PROPER
ENGINE SPEED. OVERSPEEDING
THE ENGINE ABOVE
THE FACTORY
HIGH
SPEED
SETTING
CAN
BE
DANGEROUS.
IF YOU THINK THE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING,
CONTACT
YOUR
NEAREST
AUTHORIZED
SERVtCE
CENTER/
DEPARTMENT,
WHICH HAS PROPER EQUIPMENT AND
EXPERIENCE
TO
MAKE
ANY
NECESSARY
ADJUSTMENTS
THROTTLE
LEVER
IDLE SPEED
SCREW
'
1 ....,1
|DLE MIXTURE VALVE
FIG_28
24
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