Rotax 377 - Ignition System Maintenance; Ignition System Overview and Troubleshooting; Ignition Timing Procedure

SECTION
10
I
-r1-
IONITION SYSTEM
The
ROTAX englne ls equlppeal ritb a
BoSCH
nagneto
generator
12v 1q0w ratlng,
producLng
the current neceEaary
for
tbe
gpark
anal acceaaorl.es,
The ignitlon unlt has been Eet
to
precise
toferancea
by
the factony. After
lnitlal
break-ln adiuetrcenta
&aLe no cha4gea_unlesa
absolutely necesaary.
In
case of trouble
gbgerve
the
followlng:
If the
l8|litlon faile intermittently or if tbere
are other
troubleB that are
due
to neither
6park
plug,
nor external
conponenta,
nor carburetor, the
contact breakerB nay be the cause.
contacts
nuat
be clean
and nust not be
burnt,
lrith
new englneE
or nelr
polnta
the cam-folloFer
of
the ignitlon
polnt
aet
weara
rapldly inltlally.
Reaetting
of contactB
laay therefot'e be
nece6sary
after eorne
tlme. The breaker contaets
are
accesaible
after
removal of the retind starter
and the
starting
pul1ey,
Tbe
Eagneto
hcuslnq
(fl).rhee1)
need not be re!,oved.
Once carn follower has
ItpollBheil
inn
and
points
are re-adjusted, Bettlng6 Hill hold
for
eonslcerable
tl.me.
To
check vbether the ignition timing
ie
qorrect
there ls
an
affolt
on the fan houslng,
Further,
there
are
two
Bc!'ibe
rnarks
on tbe
magneto housing,
one
for each
oyllnder,
trhen
the acribe
rnark for the cytinder concerned
llnes
up with the arrov,
the
lgnitlon
points
Bhould
iust
bave broken-
contact, thua
triggering the
lgnltlon
Epark. If setting8
are
correct, thl.B
would
comespond to a
firing
point
vrith.a tolerance
of between 1,81 and 2.r5
.nn
ar .072
and
.092 inch
in
pistor,
tflovement
lglglg
the
piston
reaches
the
top of tbe stroke.
Use
a dlal
indicator
tool. in8talled in the spark
plug
hole.
I0NITION
TII'1IN0
(mark6
procedure
)
1) Dlaconnect spark
plug
pLres
and remove 6park
pLugs,
2,
Renove reirinal
atarter assembly
from engine,
the fan
protector
anal starting
pulley.
Noter Thc gplg breaker
point
set controla
the
pagneto
alde
g1ston
anal
the
f!Jg!
breaker
point
then rernove
tlming
of
the
aet
control
a
the
P.&q!
Elqe
plston.
,)
Rogate crankshaft until breaker
points
vi61b1e
thiough
fly{heel
are
fuLly
opened,
AdJust
point
Betting to
.O72 to
-ar6
lnch urlng a feeletr
gauge
and
ecrew
drlver', aa
lllustratetl.
Repeat
procedure
for
other set
of
points.
AdjuEt
both sldeE
equally.