MAINTENANCE
IDLE SPEED CHECK/ADJUSTMENT
Start the engine and allow it to warm up to normal
operating temperature. For units equipped with Auto
Throttle, turn the Auto Throttle switch ON.
Turn the throttle stop screw (1) to obtain the specified
idle speed.
VALVE CLEARANCE CHECK/
ADJUSTMENT
Remove the head cover bolt (1), the head cover (2),
and the head cover packing (3).
Disconnect the spark plug cap from the spark plug.
Set the piston near top dead center of the cylinder
compression stroke (both valves fully closed) by pulling
the recoil starter slowly. When the piston is near top
dead center of the compression stroke, the triangle
mark (1) on the starter pulley (2) will align with the top
hole (3) on the recoil starter case (4).
If the exhaust valve is open, use the recoil starter to turn
the crankshaft one additional turn and align the triangle
mark on the starter pulley with the top hole on the recoil
starter case again.
Insert a thickness gauge (1) between the valve rocker
arm (2) and valve stem (3) to measure the valve
clearance.
If adjustment is necessary, proceed as follows.
IDLE SPEED: 1,400 ± 150 min
-1
(rpm)
(1)
(3)
(2)
(1)
Pull slowly.
(4)
(3)
(2)
(1)
VALVE CLEARANCE:
IN: 0.15 ± 0.02 mm
EX: 0.20 ± 0.02 mm
(1)
(3)
(2)
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