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SERVmCE AND ADJUSTMENTS
ENGINE
TO ADJUST THRO'N'LE CONTROL CABLE
(See Fig, 27)
o Loosen cable clamp screw to allow cable to move_
o Move throttle control lever on upper' handle to "FAST"
position,,
o Pull throttle cable out to end of travel
, Hold cable in this position and tighten clamp screw
securely.,
THROTTLE
CABLE
CLAMP SCREW
FIG. 27
TO ADJUST CARBURETOR (See Fig. 28)
The carburetor has a high speed jet and has been preset at
the factory and adjustment should not be necessary. How-
ever, minor adjustments may be required to compensate
for differences in fuel, temperature, altitude or load_ If the
carburetor does need adjustment, proceed as follows.
In general, turning the idle needle valve in (clockwise)
decreases the supply of fuel to the engine giving a leaner
fuel!air mixture. Turning the needle valve out (counter-
clockwise) increases the supply of fuel to the engine giving
a richer fuel/air mixture.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT IF SCREWS ARE
TURNED IN TOO TIGHT.
PRELIMINARY SETTING
, Air cleaner assembly must be assembled to the carbu-
retor when making carburetor adjustments.
• Be sure the throttle control cable is adjusted properly
(see above).
', With engine off, turn idle needle valve in (clockwise)
closing itfinger' tight and then turn valve out (counter-
clockwise) 1-1/2 turns_
FINAL SETTING
- Start engine and allow to warm for five minutes_ Make
final adjustments with engine running at idle and drive
control bar in "DISENGAGED" position.
= With throttle control lever in "SLOW" position, turn idle
needle valve in (clockwise) until engine begins to die
then turn out (counterclockwise) until engine runs
rough. Turn valve to a point midway between those two
positions.
IDLE RPM ADJUSTMENT
- To adjust idle RPM, rotate throttle linkage counter-
clockwise and hold against stop while adjusting idle
speed adjusting screw to obtain 1750 RPM.. Release
throttle linkage.
ACCELERATION TEST
= Move throttle control lever from "SLOW" to "FAST"
position. If engine hesitates or'dies, turn needle valve
out (counterclockwise) 1/8 turn Repeat test and
continue to adjust, if necessary, until engine acceler-
ates smoothly..
High speed stop is factory adjusted. Do not adjust or
damage may result..
IMPORTANT: NEVER TAMPER WITH THE ENGINE
GOVERNOR, WHICH IS FACTORY SET FOR PROPER
ENGINE SPEED OVERSPEEDINGTHEENGINEABOVE
THE FACTORY HIGH SPEED SETTING CAN BE
DANGEROUS. IF YOU THINK THE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
NEAREST AUTHORIZED SERVICE CENTER/
DEPARTMENT, WHICH HAS THE PROPER EQUIPMENT
AND EXPERIENCE TO MAKE ANY NECESSARY
ADJUSTMENTS.
THROTTLELINKAGE
IDLE SPEED
ADJUSTING SCREW
\
IDLE NEEDLE VALVE
FIG. 28
18