Bolens 247.29773 - Manual (Page 14)

3. Keep your engine CLEAN. Wipe off all spilled
fuel and oil. Keep the engine clean of foreign
matter and be sure the cooling fins on the
cylinder are kept clean to permit proper air
circulation. You must REMEMBER that this is
an air cooled engine and free flow of air is
essential to proper engine performance and
life.
4. You must SERVICE YOUR AIR CLEANER. The
air cleaner prevents damaging dirt, dust, etc.
from entering the carburetor and being forced
into the engine and is important to engine life
and performance.
To remove air cleaner;
A. Remove screw.
B. Remove air cleaner carefuly to prevent dirt
from entering carburetor.
C. Take air cleaner apart.
D. Wash element in detergent and solution by
squeezing similar to a sponge.
E. Wrap foam in cloth and squeeze dry.
F. Coat element with two tablespoons of engine
oil, squeeze to distribute and remove excess
oil. See figure 28.
G. Wipe air cleaner body with same solution to
remove excess oil.
H. Reassemble (see figure 28) by inserting ele­
ment into body and snapping cover into place,
fasten to carburetor with screw.
Screw Assemble
One of These'
Low Points
Towards
Narrow
Edge of
Element
Assemble Element
So Lip Extends
Over Edge of Air
Cleaner Body
Lip Will Form
Protective Seal
When Cover Is
Assembled
FIGURE 28.
NEVER RUN YOUR ENGINE WITHOUT AIR
CLEANER COMPLETELY ASSEMBLED.
CARBURETOR ADJUSTMENTS
Minor carburetor adjustment may be required to
compensate for differences in fuel, temperature,
altitude and load.
NOTE
Adjust carburetor with fuel tank half
full of regular grade gasoline.
Initial Adjustment: See figure 29.
Close needle valve (turn clockwise) then open 1 Vz
turns (turn counterclockwise). This initial adjust­
ment will permit the engine to be started and
warmed up before making final adjustment.
Final Adjustment: See figure 29.
With engine running at normal operating speed
(approximately 3000 RPM without load) close the
needle valve (turn clockwise) until engine starts to
lose speed (lean mixture). Then slowly open
needle valve (turn counterclockwise), past the
point of smoothest operation, until engine just
begins to run unevenly. This mixture should be
rich enough for best performance under load.
Hold throttle in idling position. Turn idle speed
adjusting screw until fast idle is obtained (1750
RPM). Test the engine under full load. If engine
tends to stall or die out, it usually indicates that
the mixture is slightly lean and it may be
necessary to open the needle valve slightly to
provide a richer mixture. This richer mixture may
cause a slight unevenness in idling.
Idle Adjustment Screw
Adjustment Screw
^ . Turn in to
Needle Valve Increase Speed
FIGURE 29.
CHOKE-A-MATIC CONTROL ADJUSTMENTS
See figure 30.
Proper choke and stop switch operation is
dependent upon proper adjustment of remote
controls on the powered equipment.
“Choke”
Position
Choke
Clo
“Stop”
Position
stop
Switch
FIGURE 30.
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