For Chassis Service; For Electrical Components; Minor Maintenance And Adjustments; Spark Plug - Yamaha YTZ250S 1986 Service Manual

For Chassis Service
1
Use this wrench to put the proper tension
on the steering head bearings.
2
For cylinder holder and adapter
YM-01300-1, YM-01326
Use these tools to remove and install the fork cylinder.
3
Fork seal and bushing service tool
YM-33963, YM-34482
This tool is used to install the fork oil seal.
For Electrical Components
1
Yamaha pocket tester
YU-03112
Use this tool to measure
the coil resistance,
output voltage
and amperage.
2-6
MINOR MAINTENANCE
AND ADJUSTMENTS
Spark Plug
Standard Spark Plug
Type
BSES
(NGK)
Gap
0.7 -O.S mm
(0.03 - 0.031 in)
Side electrode
1. Whenever a new spark plug is installed,
the gap must be checked and adjusted
properly. Use a wire feeler gauge to
check the gap, and adjust the gap by
bending the side electrode gently.
2.
Be sure to clean the gasket surface and
threads before installing the spark plug.
Torque the plug to specification.
Spark plug torque:
25 Nm (2.5 m·kg, 18 ft·lb)
NOTE:
If a torque wrench is not available when you
are installing a spark plug, a good estimate of
the correct torque is
112
to
114
turns past
finger tight. Have the spark plug torque to the
correct value as soon as possible with a torque
wrench.