Service manual

PERIODIC MAINTENANCE 2-23
Periodic Maintenance Procedures
•
Measure the clearance for all four valves, one at a time
between the end of the valve stem and the adjusting
screw [A] with the thickness gauge [B].
Valve Clearance (when cold)
Exhaust
0.20 ∼ 0.25 mm (0.0079 ∼ 0.0098 in.)
Inlet
0.10 ∼ 0.15 mm (0.0039 ∼ 0.0059 in.)
If the valve clearance is not correct, adjust i t (see Valve
Clearance Adjustment).
•
Then, turn the crankshaft counterclockwise with a
wrench on the alternator rotor bolt until “T-R” m ark [A] on
the alternator rotor aligns with the notch [B] as s hown:
the end of the c ompression stroke in the rear cylinder
head.
•
Measure the clearance for all four valves, one at a time
between the end of the valve stem and the adjusting
screw with the thickness gauge.
Valve Clearance (when cold)
Exhaust
0.20 ∼ 0.25 mm (0.0079 ∼ 0.0098 in.)
Inlet
0.10 ∼ 0.15 mm (0.0039 ∼ 0.0059 in.)
If the valve clearance is not correct, adjust i t (see Valve
Clearance Adjustment).
Valve Clearance Adjustment
•
Remove the valve adjusting caps.
•
Loosen the locknut and turn the adjusting screw until the
clearance is correct.
•
Hold the adjusting screw [A] from turning and tighten the
locknut [B].
Torque - Valve Adjusting Screw Locknuts: 12 N·m (1.2
kgf·m, 106 in·lb)
•
Recheck the clearance.
If the clearance is incorrect, repeat the adjustment proce-
dure.
If the clearance is correct, perform the adjustment proce-
dure on the other valve.
Spark Arrester Cleaning
WARNING
To avoid burns, wear gloves while cleaning the
spark arrester. Since the engine must be run dur-
ing this procedure, the muffler will become hot.