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2. Remove the two (2) screws on top of the engine
cover with a phillips screwdriver (Fig. 50).
3. Remove the screw behind the engine cover (Fig. 51).
4. Disconnect the spark plug wire.
5. Clean dirt from around the spark plug.
6: Remove the engine cover (Fig. 50).
7. Clean dirt from around the rocker arm cover.
Remove the screw holding the rocker arm cover with
a large flat blade screwdriver or Torx T25 bit
(Fig. 52). Remove the rocker arm cover and gasket.
8. Remove the spark plug from the cylinder head by
turning counterclockwise using a 5/8 inch socket.
Top View Of The Engine
Fig. 50
.................. Fig. 51 .............
}
RockerArm Cover
\,
Spark Plug Hole
Fig. 52
9. Pull the starter rope slowly to bring the piston to the
top of its travel. (known as top dead center). Check
that:
• The piston is at the top of its travel whilst looking in
the spark plug hole (Fig. 52).
• Both rocker arms move freely, and both valves are
closed.
If not, repeat this step.
10. Slide the feeler gauge between the rocker arm and
the valve return spring. Measure the clearance
between the valve stem and rocker arm (Fig 53).
Do both intake and exhaust valves.
Rocker Arms
iN_s
Feeler Gauge
Gasket f
Fig. 53 ..........
The recommended clearance for both intake and
exhaust is .076 - 0.152 mm (.003 - .006 in.). Use a
standard automotive 0.127 mm (.005 in.) feeler gauge.
The feeler gauge should slide between the rocker arm
and valve stem with a slight amount of resistance,
without binding (Fig. 54).
.076 - 0.152 mm
(.003 - .006 in.)
Rocker Arm
,Stem
Fig. 54
11. If the clearance is net within specification:
a. Tum the adjusting nut using a 8 mm (5/16 inch)
wrench or nut driver (Fig. 53).
• To increase clearance, turn the adjusting nut
counterclockwise.
• To decrease clearance, turn the adjusting nL_
clockwise.
b. Recheck both clearances, and adjust as necessary.
24
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