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7-9
ENGINE
CHANGE OF THE HEAT RANGE OF SPARK
PLUGS
Judging from the discoloration of spark plugs, if
they are found improper, it can be corrected by
the following two methods; changing carburetor
settings and changing the heat range of spark
plug.
• In principle, it is advisable to first use spark
plugs of standard heat range, and judging
from the discoloration of spark plugs, adjust
carburetor settings.
• If the calibration No. of the main jet must be
changed by ±30, it is advisable to change the
heat range of spark plugs and newly select
the proper main jet.
• When checking the discoloration of spark
plugs, be sure to stop the engine immediately
after a run and check.
• Avoid racing.
• When changing the heat range of spark plugs,
never attempt to change it more than ±1 rank.
• When using a spark plug other than standard,
check its heat range against the standard and
check that it is a resistance type.
• Note that even if the discoloration seems
proper, it may slightly vary with the spark plug
maker and oil in use.
Standard spark plug
BR9EVX/NGK
(resistance
type)
Содержание YZ125 2009
Страница 6: ...YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Страница 45: ...MEMO ...
Страница 46: ...2 15 CABLE ROUTING DIAGRAM CABLE ROUTING DIAGRAM ...
Страница 48: ...2 17 CABLE ROUTING DIAGRAM ...
Страница 50: ...2 19 CABLE ROUTING DIAGRAM ...
Страница 52: ...2 21 CABLE ROUTING DIAGRAM ...
Страница 80: ...3 27 CHASSIS ...
Страница 233: ......