To Adjust Carburetor; Acceleration Test - Craftsman 917.292350 Owner's Manual

SERVICE AND ADJUSTMENTS
ENGINE
TO ADJUST CARBURETOR (See Fig. 22)
The carburetor has a high speed fixed jet and has been
preset at the factory and adjustment should not be neces-
sary. However, minor adjustments may be required to
compensate for differences in fuel, temperature, altitude or
Ioad_ If the carburetor does need adjustment, proceed as
fotlows_
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 ricl_er fuel!air mixture.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT IF SCREWS ARE
TURNED 1N TOO TIGHT.
PRELIMINARY SETTING
o Air cleaner assembly must be assembled to the carbu-
retor when making carburetor adjustments°
• With engine off, turn idle needle vatve in (clockwise)
closing it finger 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 tine
control lever in "OFF" position.
o With throttle control 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
o To adjust !dEe 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
o Move throttle control lever from "SLOW" to "FAST"
position° If engine hesitates or dies, turn idre 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. OVERSPEEDING THE ENGINE ABOVE
THE FACTORY HIGH SPEED SETTING CAN BE
DANGEROUS. tF 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
THROTTLE LINKAGE
THROTTLE STOP
IDLE SPEED
ADJUSTING SCREW IDLE NEEDLE VALVE
FIG. 22
'17