Yamaha MX 1972 - Page 51

A.
Selection
of
Spark Plugs
Standard spark plugs are recommended,
but
you
may have
to
change
the spark plugs depending on the
conditions
of
running and racing
circuits.
Remember
that
for
warming
up
the engine,
hotter
type
spark plugs
should
be
used, and a
few
minutes
of
warming up
is
needed.
After the warming
up,
replace
the
spark plugs
with
those
you
have
selected.
Colder
type
...
i
STD
t
Hotter
type
Heat
NGK
Champion
Range
Hot
N21
,,
B-4E
N18
85ES
N8
N84
86ES
N6
N5
87ES
N4
B8ES
N3
II
89ES
Cold
BlOES
. . . . .
If
the
standard
type
spark p I ug
is
found
running
too
hot
and
white,
replace
it
with
a colder type.
....
If
the standard
type
spark plug is
found
sooty and
oily,
replace
it
with
a
hotter
type.
AC
Autolite
Bosch
KLG
Lodge
Marchal
AG9
FE20
BL
14
47XL
W95T2
FE30
BLN
W125T2
CL 14,CLN
46XL,46N
AG7
FE50
W145T2
CLNH
AG5
45XL,45N
AG4 W160T2
FE70
HBLN
36HS
44XL,44N
W175T2
HL
14,HLNP
35H
AG3
C44N
W200T27
35HS
C44XL
W215T28
43XL,43N
W225T2
FE75
HF2HL
AG2
2HL,HLN
34HS
C42N
W225T28
W240T28
FEBO
42XL
AG901
2HLN
2/33H
W250P21
FElOO
41XL
AG701
W260T2
3HLN
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