Sears 247-650A - Manual (Page 6)

ENGINE MAINTENANCE
To obtain long life and trouble-free service from
your engine, certain normal maintenance must be
performed as outlined below;
1. Change oil in crankcase after first two (2)
hours of operation. Then, follow instructions
outlined on pages.
a. Paper Type Element. Remove every 10 hours
or oftener if under dusty conditions. Tap to
remove loose dirt and/or blow from inside out
with low pressure air. Replace if torn or per­
forated or when plugged to maintain proper
carburetor setting (50 hours). DO NOT WASH
IN ANY LIQUID AND DO NOT OIL.
Paper Element
Element
•Attaching Screw
FIGURES.
A '
^CAUTION
Disconnect high tension wire at
spark plug to prevent accidental
starting of engine. Unscrew oil drain
plug located on side at bottom of
engine (figures).
oil as
NOTE
Always tip engine towards oil drain
hole. Be sure oil drains completely.
Replace oil drain plug and refill with
directed on page 5 or engine nameplate.
2. Check oil every five (5) operating hours or
each time equipment is used.
If engine has dip stick, keep oil level at mark
indicated by adding if necessary.
3. Cleaning engine—Thts is an aircooled engine
which operates most efficiently when the
cooling fins are clean.
Clean cylinder fins and underside of tank or
housing thoroughly of all accumulated grass and
debris.
4. Air Cleaner. (See figure 10.)
FIGURE 10.
CARBURETOR ADJUSTMENTS
Do not make unnecessary adjustment. Factory
settings are correct for most application. If
adjustments are needed, proceed as follows:
1. Close power adjusting needle (figure 11) by
turning to right (clockwise). Close finger tight
only. Forcing will cause damage.
2. Open one turn (counterclockwise).
3. Close idle adjusting needle (figure 11) by
turning to right (clockwise). Ciose finger tight
only. Forcing will cause damage.
4. Open one and one-half (1 Vz) turns (counter­
clockwise).
5. Start engine. Follow starting instructions
pages.
6. With throttle open (carburetor control at RUN
or FAST position) adjust power adjusting
needle one-eighth (1 /8) turn at a time forward
or backward until engine runs smoothly. If
engine tends to stall under load enrich
mixture siightly (counterclockwise).
7. Hold throttle lever closed or move carburetor
control to IDLE or SLOW position and adjust
idle adjusting needle until engine runs
smoothly proceeding as in step six (6) above.