Rotax 377 - Spark Plug Service and Maintenance; Spark Plug Inspection and Maintenance

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SPARK
PLUCS:
Due
to
varying
fuel
properties
etc.'
check
every
10
houra of
operation.
Beplace aa
required or annuafly,
-
proyiding
spark
plug
heat range and
the carburetor
callbration
are correct, the spark
plugs
will
have a
bro!.nish
tinge
at the electrodea
of both
spark
plugs
after
full
load
operatlon,
One sooty spark
ptug
by itsetf
usually lndicates
a
baal
plug
or faulty ignition system to that
plug
in
a sound
englne.
If both
plugs
are sooty
ith
oil. deposits,
carbu!'ation
and
air
syaten
ahouLd
be
checked.
A1ways change both
plugs
if
possi.ble,
Never interchange
plugs
fron one cylinder to
the
other.
If both
pluBs
have
I'white'r
electrodes
with
I'me1t'r
droplets'
firet suspect
lean
nixture. If
calibration
is correct and there
lg no evldence
of
nanifold leaks
ot'
lack of fuel, change the
plugE
to a
colder range. Do check if cooling systen is operatlng
correct
ly .
AI
ntt..,tton;
Heavy oi1 deposits on
the
electrodes
and
Lnsulator
cause englne troubles
and have
to
be
renoved
regularly
(every
10 hours
)
,
ff, after cleaning
or changing
the spark
pfug8, you
still.
have an ignitlon
problem,
check to see
if
only one cylinder is
affected
or both are.
Some thought to what
is
common
to
both
aystens
or only
one will isolate the
problen
more
efficiently,
If no external
fault is
found,
the ignition
uni.t nust
be
checked.
Never
clean 2-cycle spark
plugs
with
abrasive
cleaners.
Renenber to correctly
gap yourplugs
with a
wire
gauge
-
0,{ to
0,5
n[!
or ,015 to ,020 in,
spark
plugs
rnust be
torqued
to 27
Nn or
240 in.lb.
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