Service Manual
Compression Test Assembly
The compression tester is used to determine the
Clean tapered section of the flywheel
so
no oil or dirt
condition of valves, piston, piston rings and the
are present. Install woodruff key on the crankshaft.
engine cylinder.
Install flywheel on crankshaft and tighten to torque
specified in
Assembly Torques.
Install sheet metal.
To
check compression: Tighten bolts to torque specified in
Assembly
1.
Run the engine until thoroughly warm.
Torques.
2.
Stop the engine and remove the spark plug.
VALVE COVER
3.
Remove the air cleaner and place the throttle
4.
Insert the compression gauge in the spark plug
5.
Crank the engine and note the reading. pull off the valve cover.
and choke in the wide open position. Remove the valve cover to gain access to the cylin-
hole.
1.
Remove the valve cover mounting bolts and
Refer to
Specifications
for compression pressure.
2.
Clean the valve cover.
Be
careful not to dam-
There may
be
variations due to equipment, tem-
age the surface of the cover where the gasket
perature, atmospheric conditions and altitude.
mounts.
These pressures are for a warm engine at cranking
3.
Clean the cylinder head and cover thoroughly
speed (about
300
rpm). in the cover gasket mating area. Make sure the
der head, breather assembly and valve system.
breather assembly
is
correctly seated in the
FLYWHEEL
cylinder head cavity.
4.
Install a new valve cover gasket.
Disassembly
5.
Place the valve cover in position and install the
WARNING
Accidental starting of the englne
can result In severe personal Injury or death.
Disconnect the negatlve
(-)
battery cable and
spark plug wire before the servlcing engine,
controls, or associated equipment.
WARNING
Incorrect flywheel removal can
result In severe personal Injury.
Do
not remove
the flywheel nut completely when using the
flywheel puller.
Remove screen or recoil starter assembly and fly-
wheel cup
if
equipped with recoil starter. Remove
sheet metal surrounding flywheel. Loosen the fly-
wheel mounting nut. Use a flywheel puller to re-
move flywheel. Remove the woodruff key on the
crankshaft.
Service/Inspection
\
Remove dirt, chaff, or other contaminants from
screen and flywheel. Inspect screen and flywheel
for damage. Replace screen
if
damaged in any way.
Replace flywheel
if
ring gear
or
flywheel is damaged
in any way.
mounting bolts. Torque
all
of the bolts in a star
pattern until they are tightened to the specified
torque.
ROCKER ARM
Disassembly
Refer to
Figure11-1.
Remove snap ring and pull out
rocker arm.
Inspection/Service
Rocker
Am
and Rocker Am Shaft Clearance:
Measure the rocker arm shaft outside diameter.
Measure the rocker arm inside diameter and calcu-
late the clearance.
If
clearance is not as specified in
Dimensions .and Clearances,
replace the rocker
arms.
If
clearance
still
exceeds that specified in
Di-
mensions and Clearances,
replace rocker arm
shaft assembly.
Assembly
Apply engine oil to the rocker arm shaft. Assemble
components on rocker arm shaft.