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MAINTENANCE
VALVE CLEARANCE
With No. 1 piston at TDC of compression stroke, check valve
clearances for cylinders shown in chart below. Rotate crank-
shaft 360° clockwise to check remaining valves. Adjust in
same order, if required.
Note: If engine is running normally, this check and adjustment
may be omitted.
[1]. Loosen adjusting lock nut.
[2]. Using a wrench to hold adjusting lock nut, adjust with
screwdriver. Determine clearance using a feeler gauge.
[3]. While holding screw driver in place, torque adjusting
lock nut.
Valve clearances (cold):
Int
Exh
Adjusting lock nut torque: 110 kg-cm (95 in-lbs.)
Check valve cover gasket for leakage. Replace if required.
Torque valve cover nuts to 55 kg-cm (48 in-lbs.)
FUEL FILTER
[1]. Disconnect spark plug wires and keep away from
spark plugs.
[2]. When replacing fuel
filter, ensure clamps
are tight and fuel
flows as shown.
FAN BELT
♦ Check condition of fan belt.
♦ Replace if damaged or worn.
To check for correct fan belt tension
When 10 kg (22 lbs.) of force is pressed at center of span
between fan and alternator, there should be 10 to 12 mm
(3/8 − 1/2 in.) of belt movement.
0.18 mm (0.007 in.)
0.18 mm (0.007 in.)
DIRECTION OF FUEL FLOW
FUEL TANK
SIDE
CARBURETOR
SIDE
Piston Position
No. 1 piston at TDC, of compres
No. 1 piston at TDC, of compres-
sion stroke
Rotate Crankshaft 360° clockwise
Rotate Crankshaft 360° clockwise
WRENCH
Drain fuel tank or close fuel shut-off valve
before replacing fuel filter. Otherwise, fuel can
leak out, creating a fire/explosion hazard.
10 − 12 mm
(3/8 − 1/2 Inch)
BELT MOVEMENT
13
Cylinder
1
Int
D
Exh
D
Int
Exh
SCREW
DRIVER
WARNING
2
3
D
D
D
D
FEELER
GAUGE
BELT
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