To Adjust Throttle Control Cable; To Adjust Carburetor; Idle Rpm Adjustment; Acceleration Test - Craftsman 917.299691 Owner's Manual

SERVICE AN ADJUSTM NTS
ENGINE
TO ADJUST THROTTLE CONTROL CABLE
(See Fig. 29)
• Loosen cable clamp screw to allow cable to move,
, Move throttle control lever on upper handle to "FAST"
position.
•Puti throttle cable out until engine betlcrank is back as
far as it will go,
• Hold cable in this position and tighten clamp screw
securely.
CLAMP SCREW
THROTTLE
CABLE
BELLCRANK
F_G. 29
TO ADJUST CARBURETOR (See Fig. 30)
The carburetor has been preset at the factory and ad-
justment should not be necessary_ However, minor ad-
j{_stments 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 needle valve in (clockwise) de-
creases 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 tN 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 controt cable is adjusted properly
(see above).
• With engine off turn needle valve in (clockwise) closing
it finger tight and then turn out (counterclockwise) 1-1/
2 turns.
FINAL SETTING -
° Start engine and altow to warm for five minutes. Make
final adjustments with engine running and gear shift
control lever in "NEUTRAL" position.
• With throttle control lever in "SLOW" position, turn
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 posi-
tions.
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.
ACCELERATfQN 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 con-
tinue to adjust, if necessary, until engine accelerates
smoothly.
High speed stop is factory adjusted. Do not adjust dam-
age may result.
IMPORTANT: NEVER TAMPER WITH THE ENGINE
GOVERNOR, WHICH iS FACTORY SET FOR PROPER
ENGINE SPEED, OVERSPEEDING THE ENGINE ABOVE
THE FACTORY HIGH SPEED SETTING CAN BE
DANGEROUS, tF YOU THINKTHE ENGINE-GOVERNED
HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR
NEARESTAUTHORJZED SERVICE CENTER, WHICH HAS
PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY
NECESSARY ADJUSTMENTS,
THROTTLE
LINKAGE
THROTTLESTOP
IDLE SPEED
ADJUSTING
SCREW
NEEDLE
VALVE
FIG. 30
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