Power unit (check and adjustment)
7-2
• Use a pressure gauge with an adapter that
has a 1/8 pitch thread.
• The actual oil pressure may vary depending
on the temperature and engine oil viscosity.
e. Remove the oil pressure gauge.
f. Install the oil pressure switch. See
“Cylinder block” (7-42).
Checking the pulser coil air gap
Do not turn the flywheel magneto counter-
clockwise. Otherwise, the water pump im-
peller could be damaged.
1. Check:
• Pulser coil air gap
Out of specification Adjust the air gap.
a. Turn the flywheel magneto clockwise
to align the protrusion “a
” on the fly-
wheel magneto with the protrusion “b”
on the pulser coil.
b. Measure the pulser coil air gap “c”.
Checking the valve clearance
• Measure the valve clearances when the en-
gine is cold.
• Cover the fuel components using a rag to
prevent fuel from spilling out.
Do not turn the flywheel magneto counter-
clockwise. Otherwise, the water pump im-
peller could be damaged.
1. Check:
• Valve clearance
Out of specification Adjust. See “Adjust-
ing the valve clearance” (7-5).
a. Reduce the fuel pressure. See “Re-
ducing the fuel pressure” (6-1).
b. Drain the fuel. See “Draining the fuel”
(6-14).
c. Remove the clamps “1”, “2”, and “3”.
d. Remove the bracket bolt “4” and
bracket “5”.
e. Disconnect the hose “6” and quick
connector “7”. See “Disconnecting the
quick connector” (6-1).
Oil pressure gauge “1”
(commercially available)
Pulser coil
Air gap
0.36–1.14 mm (0.014–0.045 in)
Valve clearance IN (cold engine)
0.15–0.25 mm (0.0059–0.0098
in)
Valve clearance EX (cold engine)
0.25–0.35 mm (0.0098–0.0138
in)
b
a
c
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