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Spark plug
1. Check electrode condition and wear, insula-
tor color, and electrode gap.
2. Clean the spark plug with spark plug cleaner
if necessary. Use a wire gauge to adjust the
plug gap to specification.
3. If the electrode becomes too worn, replace
the spark plug.
4. When installing the plug, always clean the
gasket surface, wipe off any grime that might
be present on the surface of the spark plug,
and torque the spark plug properly.
Standard spark plug:
D8EA (NGK) or
X24ES-U(NIPPON DENSO)
Spark plug gap:
0.6-0.7 mm (0.024-0.028 in)
Spark plug tightening torque:
20 Nm (2.0 m-kg, 14 ft-lb)
Crankcase ventilation system
Check the ventilation pipe from the cylinder head
cover on the each cylinder to the air filter assembly
for cracks or damage; replace if necessary.
Fuel line
Check the fuel hoses and vacuum lines for cracks or
damage; replace if necessary.
Exhaust system
1. Retighten the exhaust pipe flange bolts and
muffler clamp bolts.
Tightening torque:
Exhaust pipe flange bolt
10 Nm (1.0 m-kg, 7.2 ft-lb)
Muffler clamp bolt
20 Nm (2.0 m-kg, 14 ft-lb)
2. Replace the exhaust pipe gasket(s) and/ or
muffler gasket(s) if necessary.
Carburetor synchronization
Carburetors must be adjusted to open and close
simultaneously. Adjust as follows:
N OTE:
Valve clearance must be set properly before syn-
chronizing the carburetors.
1. Remove the vacuum lines from each carbu-
retor joint, and install the vacuum gauge
lines to each carburetor joint.
NOTE:
The front cylinder carburetor joint has two vacuum
lines coming out of it. Disconnect the smaller diame-
ter line, and leave the larger line in place on the
carburetor joint.
2. Turn the fuel cock to the "PRI" position.
3. Start the engine, and let it warm up.
4. Read the vacuum gauge. The readings for
each carburetor should be the same. If not,
adjust the synchronizing rod until the read-
ings are the same.
1. Synchronizing rod
5. Reconnect the vacuum lines.
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