MTD 249-640A - Manual (Page 13)

3. Cleaning engine—This is an aircooled engine which
operates most efficiently when the cooling fins
are clean.
,si»—^ean cylinder fins and underside of tank or housing
oroughly of all accumulated grass and debris.
4. Air Cleaner. (See figure 28).
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 perforated or
when plugged to maintain proper carburetor
setting (50 hours). DO NOT WASH IN ANY
LIQUID AND DO NOTOIL.
a.
Paper Element
Element
Attaching Screw
FIGURE 28
CARBURETOR ADJUSTMENTS (See figure 29)
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 29) by
turning to right (clockwise). Close finger tight
only. Forcing will cause damage.
2. Open one turn (counterclockwise).
3. Close idle adjusting needle (figure 29) by turning
to right (clockwise). Close finger tight only.
Forcing will cause damage.
4. Open one and one-half (1-1/2) turns (counter­
clockwise).
5. Start engine. Follow starting instructions page 5.
With throttle open (carburetory control at RUN
or FAST position) adjust power adjusting needle
one-eighth (1/8) turn at a time forward to back­
ward until engine runs smoothly. If engine tends
to
stall under lead 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 in step six (6) above.
8. Allow several seconds between each adjustment
when performing either step six (6) or seven (7)
to allow engine to react to new setting.
POWER ADJUSTING
NEEDLE
FIGURE 29
STORAGE INSTRUCTIONS
In event engine is to be stored for any length of
time (30 days or more), prepare as follows:
1. Drain gasoline by tipping or by syphon hose,
then run engine until remainder is used and tank
and carburetor are empty.
A
CAUTION
Drain into container outdoors away
from fire or flame.
2. Drain carburetor by running engine until it stops
3. Inside protecting of engine for storage is per­
formed by removing spark plug and pouring one
ounce of SAE 30 oil through spark plug hole
into cylinder. Crank engine, without starting,
several times to spread oil over cylinder walls.
13 4. Never store outside without a waterproof cover.