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TROUBLESHOOTING
13
w
lORMAL
Appearance-Firing
tip has de-
ios~ts of light gray to light tan
Can be cleaned, regapped a n d
eused
:ARBON FOULED
Appearance-Dull dry black w ~ t h
luffy carbon depos~ts o n t h e i n
ulator t i p electrode and exposed
hell
Caused by-Fuellair m ~ x t u r e too
c h plug heat range too cold
teak ignition system
dirty air
leaner faulty automatic choke or
xcesslve Idling
Can be cleaned regapped a n d
eused
31L FOULED
Appearance-Wet black d e p o s ~ t s
I n insulator and exposed shell
Caused by-Excessive oil enter-
n g the
combust~on chamber
hrough worn rlngs pistons valve
g d e s or bear~ngs
1
Replace with new plugs (use a
latter plug if engine 18 not re
)aired)
LEAD FOULED
Appearance
-
Yellow m u l a t o r
deposits (may sometimes be dark
gray black or tan in color) o n the
insulator t ~ p
Caused by-Highly leaded gaso-
lhne
Replace with new plugs
LEAD FOULED
Appearance-Yellow
glazed de-
pos~ts i n d c a t ~ n g melted lead de-
posits due to hard acceleration
Caused by-Highly
leaded gas@
line
Replace with new plugs
OIL AND LEAD FOULED
Appearance-Glazed
yellow de
p o s ~ t s w ~ t h a s l ~ g h t b r o w n ~ s h tint
on t h e insulator t i p and ground
electrode
Replace w i t h new plugs
FUEL ADDITIVE RESIDUE
Appearance
-
Brown colored
hardened ash deposits on the insu
lator t ~ p a n d ground electrode
Caused by-Fuel a n d l o r oil addi-
t ~ v e s
Replace w ~ t h new plugs
WORN
Appearance
-
Severely worn or
eroded electrodes
Caused by-Normal
wear
or
unusual 011 a n d l o r fuel add~tives
Replace w ~ t h new plugs
PREIGNITION
Appearance
-
Melted ground
electrode
Caused by-Overadvanced
ignl
t i o n t i m i n g inoperative ignhtion
advance mechanism too low of a
f u e l octane rating lean fuellair
m ~ x t u r e or carbon deposits in com-
bustion chamber
PREIGNITION
Appearance-Melted center elec.
trade
Caused by-Abnormal
combus-
t i o n due to overadvanced i g n i t ~ o n
t i m ~ n g or ~ n c o r r e c t advance too
low of a fuel octane rating lean
f u e l l a i r mixture or carbon de-
posits I n combustion chamber
Correct engine problem and
replace w i t h new plugs
INCORRECT HEAT RANGE
Appearance-Melted center elec-
trode and white blistered ~nsulator
t i p
Caused by-Incorrect plug heat
range select~on
Replace w ~ t h new plugs
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   Also See for Kawasaki KZ500

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Zx550Kz550Kzx550

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