Poulan 161673 - Manual (Page 16)

SERVICE AND ADJUSTMENTS
TO REMOVE BELT GUARD (See Fig. 22)
• . Remove two (2) cap nuts and washers from side of belt
guard.
• Loosen (do not remove) tine shield nut on underside of
tine shield.
• " Pull belt guard out and away from unit.’
• Replace belt guard by reversing above procedure. Be
sure slot in bottom of belt guard is under head of tine
shield bolt and all nuts are tightened securely.
ENGINE
TO ADJUST CARBURETOR (See Fig. 23)
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
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 fuei/air mixture.
IMPORTANT: DAMAGE TO THE NEEDLES AND THE
SEATS IN CARBURETOR MAY RESULT IFSCREWS ARE
TURNED IN TOO TIGHT,
PRELIMINARY SETTING
•
Air cleaner assembly must be assembled to the carbu­
retor when making carburetor adjustments.
• With engine off, turn idle needle valve in (dockvi/ise)
dosing 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.
• 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
• , To adjust idle RPM, rotate throttle linkage counterclock­
wise and hold against stop while adjusting idle speed
adjusting screw to obtain 1750 RPM. Release throttle
linkage.
ACCELERATION TEST
• Move throvhe control lever from “SLOW” to “FAST”
position. If engine hesitates or dies, turn idle 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:
N E V E R T A M P E R W I T H T H E E N G I N E
GOVERNOR, W H I C H I S F A C T O R Y S E T F O R P R O P E R
E N G I N E S P E E D . O V E R S P E E D I N G T H E E N G I N E A B O V E
T H E F A C T O R Y H I G H S P E E D S E T T I N G C A N B E
D A N G E R O U S . I F Y O U THINK T H E E N G I N E - G O V E R N E D
H I G H S P E E D N E E D S A D J U S T I N G . C O N T A C T Y O U R
N E A R E S T
A U T H O R I Z E D S E R V I C E CENTER/
D E P A R T M E N T , WHICH H A S T H E P R O P E R E Q U I P M E N T
A N D E X P E R I E N C E T O M A K E A N Y N E C E S S A R Y
A D J U S T M E N T S ,
16