MTD 248-650A - Manual (Page 9)

^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 (figure 16).
NOTE
Always tip engine towards oil drain
hole. Be sure oil drains completely.
Replace oil drain plug and refill with oil as
directed on page 5 or engine nameplate.
2. Check oil every five (5) operating hours or
each time equipment is used.
Paper Element
Element
-Attaching Screw
FIGURE 17.
If engine has dip stick, keep oil level at mark
indicated by adding if necessary.
3. Cleaning engine—This 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 17.)
а. 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.
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 (figuréis) by
turning to right (clockwise). Close finger tight
only. Forcing will cause damage.
2. Open one turn (counterclockwise).
3. Close idle adjusting needle (figuréis) by
turning to right (clockwise). Close finger tight
only. Forcing will cause damage.
4. Open one and one-half (1V 2 ) turns (counter­
clockwise).
5. Start engine. Follow starting instructions
pages.
б. With throttle open (carburetor control at RUN
or FAST position) adjust power adjusting
needle one-eighth 0 /8) turn at a time forward
or backward until engine runs smoothly. If
engine tends to stall under load enrich
mixture slightly (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.
8. Allow several seconds between each adjust­
ment when performing either step six (6) or
seven (7) to allow engine to react to new
setting.