3-13
dummyhead
dummyhead
MAINTENANCE
IDLE SPEED CHECK/ADJUSTMENT
Ensure the governor arm and governor arm shaft are
installed correctly (page 7-5).
Use a tachometer with graduations of 50 min
-1
(rpm) or
smaller that will accurately indicate 50 min
-1
(rpm)
change.
Start the engine and allow it to warm up to normal
operating temperature.
Turn the throttle stop screw [1] to obtain the specified
idle speed.
VALVE CLEARANCE CHECK/
ADJUSTMENT
Inspect and adjust the valve clearance while the engine
is cold.
CHECK
Disconnect the spark plug cap [1] and remove the
following:
– Breather tube [2]
– Head cover bolt (6 x 12 mm) [3] (4)
– Head cover [4]
– Head cover packing [5]
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.
IDLE SPEED: 1,400
+ 200
min
-1
(rpm)
– 150
[1]
[4]
[1]
[2]
[3]
[5]
Pull slowly.
[2]
[4]
[3]
[1]
62Z4H000.book 13 ページ ２０１１年５月２０日 金曜日 午前１０時５分
