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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 carbu-
retor settings and changing the heat range of
spark plug.
Standard spark plug
5PA70110
In principle, it is advisable to first use spark
G
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
G
changed by ±30, it is advisable to change the
heat range of spark plugs and newly select
the proper main jet.
NOTE:
When checking the discoloration of spark
G
plugs, be sure to stop the engine immedi-
ately after a run and check.
Avoid racing.
G
When changing the heat range of spark
G
plugs, never attempt to change it more than
±1 rank.
When using a spark plug other than stan-
G
dard, check its heat range against the stan-
dard and check that it is a resistance type.
Note that even if the discoloration seems
G
proper, it may slightly vary with the spark
plug maker and oil in use.
7 - 9
T U N
SETTING
BR10EG/NGK
(resistance type)
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