To adjust carburetor (see fig. 23), Service and adjustments, Engine – Poulan 163760 User Manual
Page 16
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SERVICE AND ADJUSTMENTS
TO REMOVE
‘JTRD
{ S e e
Fig. 22)
» Remove t.vo(l) cap nutf,;-r..jwa -her’ 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.
FIG. 22
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 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.
•
With engine off, turn idle needle valve 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.
c V v i t i ' , t
111
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, I r- i VI *- M
, t I |. 1 f' 1 d| i| < I , J. I I
C l . t ( ' I h i l i ' < 1 > . , M ' i i
n i ) i | » n i , t K
l
I J ' I ' U ' M
V ' t l i ( i h C < » ' I ' l l l i i d . i ' 1 3 : 1 J ; i / r 1 - 1 1 ' i . • ( t v v i p j c i t l ' I f .
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 throttle 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:
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.
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.
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