2001 Yamaha Motorsports Zuma ll Owners Manual - Page 48

2001 Yamaha Motorsports Zuma ll Manual

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PERIODIC MAINTENANCE AND MINOR REPAIR If electrode erosion becomes excessive, or if carbon and other deposits are excessive, you should replace the spark plugs with the specified plug. Standard spark plug: BR8HS (NGK) Before installing the spark plug, measure the electrode gap with a wire thickness gauge and adjust the gap to specification as necessary. Spark plug gap: 0.5 ~ 0.7 mm (0.020 ~ 0.031 in) When installing the plug, always clean the gasket surface and use a new gasket. Wipe off any grime from the threads and tighten the spark plug to the specified torque. Tightening torque: Spark plug: 20 Nm (2.0 m·kg, 14 ft·lb) 7 EUU03801 1 1. Spark plug gap EAH20202 NOTE: If a torque wrench is not available when you are installing a spark plug, a good estimate of the correct torque is 1/4 to 1/2 turn past finger tight. Have the spark plug torqued to the correct value as soon as possible with a torque wrench. Spark plug inspection The spark plug is an important engine component and is easy to inspect. The condition of the spark plug can indicate the condition of the engine. The ideal color on the white porcelain insulator around the center electrode is a medium-to-light tan color for a scooter that is being ridden normally. Do not attempt to diagnose any problems yourself. Instead, take the scooter to a Yamaha dealer. You should periodically remove and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode. 7-4

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7
PERIODIC MAINTENANCE AND MINOR REPAIR
7-4
1. Spark plug gap
1
EAH20202
Spark plug inspection
The spark plug is an important engine
component and is easy to inspect. The
condition of the spark plug can indicate
the condition of the engine. The ideal
color on the white porcelain insulator
around the center electrode is a me-
dium-to-light tan color for a scooter that
is being ridden normally. Do not attempt
to diagnose any problems yourself.
Instead, take the scooter to a Yamaha
dealer. You should periodically remove
and inspect the spark plug because
heat and deposits will cause the spark
plug to slowly break down and erode.
If electrode erosion becomes exces-
sive, or if carbon and other deposits are
excessive, you should replace the
spark plugs with the specified plug.
Standard spark plug:
BR8HS (NGK)
Before installing the spark plug,
measure the electrode gap with a wire
thickness gauge and adjust the gap to
specification as necessary.
Spark plug gap:
0.5 ~ 0.7 mm (0.020 ~ 0.031 in)
When installing the plug, always clean
the gasket surface and use a new
gasket. Wipe off any grime from the
threads and tighten the spark plug to
the specified torque.
Tightening torque:
Spark plug:
20 Nm (2.0 m·kg, 14 ft·lb)
EUU03801
NOTE:
If a torque wrench is not available when
you are installing a spark plug, a good
estimate of the correct torque is 1/4 to
1/2 turn past finger tight. Have the spark
plug torqued to the correct value as
soon as possible with a torque wrench.