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JET VALVE ASSEMBLY
CAUTIONS
1. The cylinder head bolts should be retightened before
attempting this adjustment.
2.
If the jet valve clearance is not good, this will affect not
only the exhaust gas level, but also be the cause of engine
trouble. It is, therefore, important that the correct adjust-
ment procedures be followed, as described here.
1.
Start the engine and allow it to warm up until the temper-
ature of the coolant reaches 80 to 95°C (176 to 203°F).
2.
Check the ignition timing and idling speed, and adjust if nec-
essary.
3.
Disconnect the air intake hose and air intake pipe.
4.
Remove the rocker cover.
5.
Remove timing belt front upper cover.
6.
Turn crankshaft clockwise and align with camshaft sprocket
timing mark.
7.
Check that valve clearance indicated in the diagram is at the
standard value.
JET VALVE CLEARANCE ADJUSTMENT
Y20KDOA
Exhaust
No. 1
No.2
No.3
No.4
Jet valve clearance
Hot engine
0.25 mm (0.0098 in.)
Cold engine
0.17 mm (0.0067 in.)
Intake
20Yl00
8.
If valve clearance is off the standard value, loosen rocker arm
adjusting screw locking nut. Use feeler gauge and adjust
valve clearance by turning adjusting screw.
9.
Secure rocker arm adjusting screw with screw driver so that
it will not rotate and tighten locking nut.
20Yl01
10. Rotate the crankshaft clockwise one complete revolution
(360 degree).
11. Check that valve clearance indicated in the diagram is at the
standard value.
12. Repeat steps 8. and 9. to adjust the valve clearance of
remaining valves.
+
Exhaust
No. 1
No.2
No.3
No.4
Intake
20Yl02
20-49
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