Sears 536.79751 - Manual (Page 14)

SERVICE AND ADJUSTMENTS
To replace ihe blade, do the following:
• Disconnect the spark plug wire.
® Remove the flange nut (See Fig. 12} securing the
blade to the drive shaft,
• Remove the blade.
® Install the new blade and tighten the nut securely,
® Reconnect the spark plug wire.
CARBURETOR ADJUSTMENT
IMPORTANT: NEVER ATTEMPT TO CHANGE THE
MAXIMUM ENGINE SPEED., EXCES­
SIVE SPEEDS CAUSED BY BY-PASS­
ING THE GOVERNOR CAN CAUSE
DAMAGE TO THE ENGINE.
Never make unnecessary adjustments to the carburetor,
The carburetor was set at the factory to operate effe-
ciently for most applications. However, if adjustments are
required, we recommend that you contact a competent
repairman such as at a SEARS Service Center If you fee!
that you are competent to make the carburetor adjust­
ments, do the following:
® Turn the high-speed adjustment needle (see Fig.
13) clockwise to "finger tight" only. Use a regular
screwdriverio turn the idle speed adjustment needle
clockwise
IMPORTANT; THE NEEDLES AND/OR SEATS CAN
E DAMAGED IF OVERTIGHTENED
A CAUTION: USE EXTREME CARE WHEN
MAKING
ADJUSTMENTSTHATREQUIRE
THE ENGINE TO BE RUNNING. KEEP
HANDS, FEET, HAIR AND LOOSE CLOTH­
ING AWAY FROM ANY MOVING PART.
Turn the high-speed and the idle-speed adjustment
needles counterclockwise one (1) turn. This adjust­
ment will allow the engine to be slaried.
Start the engine and move the throttle control lever
to FAST position and allow the engine to warm up.
Turn the high-speed adjustment needle counter­
clockwise until the engine starts to cut off. Note the
position of the high-speed adjustment needle.
Turn the high-speed adjustment needle clockwise
until the engine starts to cut off. Note the position of
the high-speed adjustment needle.
Turn the high-speed adjustment needle halt way
between the two cut off points
Move the throttle control lever to the idle speed
Adjust the idle-speed adjustment needle in the
same manner as the high-speed adjustment needle.
FIG. 12
14