Clean and inspect the spark arrestor screen
as follows:
Inspect the screen and replace if it is torn, perforated
or otherwise damaged (see Steps 1-4 below). DO NOT
USE a defective screen. If the screen is not damaged,
clean it with a commercial solvent.
If the spark arrestor is found to be damaged or defec-
tive, replace it as follows:
1. Remove the four (4) screws that connect the heat
shield to the muffler (Figure 10).
2. Remove the four (4) screws that attach the spark
arrestor screen (Figure 10).
3. Replace damaged screen with new screen
(Part No. 083083).
4. Reattach the screen with the four (4) screws.
Reinstall the heat shield to the muffler with the
four (4) screws.
seRviCe and adJusTMenTs
engine speed
*
The maximum engine speed was properly set
at the factory. Do not attempt to change this
setting. Operating the engine at high engine
speeds is dangerous and increases the risk of
personal injury or damage to the equipment.
If the engine is running too fast , take it to an
authorized service center for repair and adjust-
ment. CHANGING THE ENGINE’S MAXIMUM
GOVERNED SPEED WILL VOID THE ENGINE
WARRANTY.
*
Operating the engine at low engine speeds
with heavy loads may shorten the engine’s
life. Do not operate the engine below half
throttle except for idling.
The engine runs at a constant speed. This constant
operating speed is maintained by a mechanical gover-
nor. DO NOT try to adjust the governed speed setting
for the following reasons:
• Operating the engine at high engine speeds is dan-
gerous and increases the risk of personal injury or
damage to the equipment.
• Operating the engine at low engine speeds with
heavy loads may shorten the engine’s life.
CaRBuReToR adJusTMenTs
The carburetor of the engine is pre-set at the factory.
The carburetor should not be tampered with because
this will
vOID THE EmISSION CONTROL SYSTEm
WARRANTY
. If problems occur with the engine used
at altitudes in excess of 5000 feet, contact the near-
est authorized dealer regarding high altitude setting
changes.
CheCking/adJusTing valve To RoCkeR
aRM CleaRanCe
*
Without proper valve lash the engine may
require extreme force to start. This can be dan-
gerous to the operator during manual (pull)
starts. Improper valve lash may also result in
premature wear of the engine.
After the first 50 hours of operation
, remove the
rocker cover and check the valve to rocker arm clear-
ance.
When adjusting the clearance, the engine should be at
room temperature, and the piston should be at Top
Dead Center (TDC) of its compression stroke (both
valves are closed). The correct clearance is 0.05-
0.1mm (0.002-0.004 in.). Check and adjust the valve
to rocker arm clearance as follows:
1. Remove spark plug to avoid accidental starting.
2. Remove the four (4) screws from the rocker cover
(Figure 11).
3. Remove the rocker cover and rocker cover gasket.
Figure 11 - Removing the Rocker Cover
ROCKER
COVER
SCREWS
ROCKER
COVER
SCREWS
STOP
RUN
LOW OIL
INDICATOR
ENGINE SHUTS OFF
4. Rotate the engine using the recoil until the engine
is at top dead center of the compression stroke.
This can be determined by watching the piston
movement through the spark plug hole. Rotate the
engine until the piston reaches its highest point
after the intake valve closes. Both valves should
now be closed.
section 3 — Maintenance
gsh-220 engine
