FOREWORD
This service manual provides technical informationonthe
1980
models including
its
features, differences
from
the
1979
models
and
new
service procedure.
Please read
this
manual
thoroughlysothat
you can have a good knowledgeofthe
new
model and make
best
useofit in your sales
and after-service activities.
SERVICE
DEPARTMENT
YAMAHA
MOTOR
CO,. LTD.
NOTE:
--~---
_
The Research and Engineering Departments
of
Yamaha are
continually
striving to
further
perfect all models.
Improvements
and
modifications
are therefore inevitable.
In
lightofthis
fact, all specifications
within
this
manual are subject to change
without
notice.
Particularly
important
information
is dis-
tinguished in
this
manual by
the
following
notations:
NOTE:
A NOTE provides key
information
to make
procedures easier or cleaner.
CAUTION:
A CAUTION indicates special procedures
that
mustbefollowed
to avoid change to
the
machine.
WARNING:
A
WARNING
indicates special procedures
that
must
be
followed
to avoid injury to a
machine
operator
or person inspecting or re-
pairing the machine.
·1980 ET250
CONTENTS
1. MODI·FICATIONS , ..
A. ENGINE , ...
8. DRIVE , 3
C. CHASSiS , 4
D. ELECTRICAL. , , 6
2. SERVICE 7
A.
NEW
SERVICE PROCEDURE 7
B. MAINTENANCE INTERVALS 10
C. SPECiFiCATIONS 12
D. SPECIAL TOOLS 17
E.
WIRE ROUTING
DIAGRAM
19
F.
WIRING
DIAGRAM
20
A.
ENGINE
1. Left crank
Due to use of a new type clutch, the
crankshaft is tapered at its end to
mount
the
clutch.
'79
model
1.
Left
crank
(8F3-11412-00)
. 2. Bearing
(93306-30605)
3. Oil seal
(93102-32161)
Interchangeability: No
(Refer to
"8.
Drive, clutch.")
As a result. the bearing and oil seal inside diameters are changed from 32
mmto
30
mm.
'80
model
1. Left crank
(8J2-11412-00l
2.'
8earing(93306-30617)
3. Oil seal
(93102-30188)
-1
1980 ET250
2. Starter
The air duct is no longer provided
be-
cause there
will
be no problem of
overheating. Accordingly, the insert for
mounting
of
the air
duct
on the starter
case is no longer used.
1. Air duct ... No longer used
(8G5-15471-001
2. Screw... No longer used
(98506-050081
3. PlainwasherH'No longer used
(92906-05200)
4. Starter case
(8F3-15711-01
)
-2-
NOTE:
------------,---
The
1979
model can also be used
without
installing the air duct.
B. DRIVE
Primary sheave
For better clutch operation and increased
durability, the new clutch has been adopted.
'79
model
1. Primary sheavecap complete
(8H7-17630-00l
2. Bolt
(90105-12009l
3. Washer
(90215-12084)
4. Washer
(90201-121911
5. Primary sliding sheavecomplete
(8F3-17620-00)
6.
Compressionspring
(90501-55451)
7. Nut
190179-28088)
8. Washer
(90208-28003)
9. Spring set
(820-17644-00)
10. Cam
(8G5-17623-00)
11. Primary
fixed sheavecomplete
(8E3-17610-00)
-3-
'80
model
1. Primaryfixed sheave complete
(8H9-17610-00)
2. Primary sliding sheave
18H9-17621-00l
3. Bushing
(90389-39023)
4. Cap
(8H9-17631-00l
5. 8ushing
(90389-26022)
6. Bolt
(97311-06025)
7.
Boll(97311-06040)
B. Spring washer
(92902-06100)
9. Spider (8H9-17627-00)
10. Slide 18A7-17653-00)
11. Pin with hole
(90240-07066)
12. Plate washer
(90201-06589)
13. Weight (8H9-17632-001
14. Collar(90387-096981
Interchangeability:
1980 ET250
2
15. Collar
(90387-06697)
16. Bolt
IBH9-17647-00l
17. Plate washer
(90201-06053)
1B. Cotter pin
(91402-25012)
19. Compression spring
(90501·55345)
20. Cam(BJ2-17623-00)
21. Hexagon bolt
(90101-06440\
22. Self locking nut
(95601-06100)
23. Plate washer
(90201-06727)
24. Platewasher
(90201-09728l
25. Platewasher
(90201-06750)
No
1980ET250
C. CHASSIS
1. Frame
(8H7-21910-00
--+
8K3-21910-00)
o For better durability
of
the frame, the
engine hood material
IS
changed from
aluminum to steel plate (Black coating).
o The drive guard bracket is welded to
the hood for easy assembling.
o The front part of
the
frame is painted
black as part of the new
1980
model
design.
Attl
....Steel
plate (blackl
Welded drive guard bracket
8K3-2191
0-00
can be used on both
79
and
'80
models.
8H7-21910-00
can
not
be used on
'80
model.
2. Steering gate
(8H7
-23871-00
__8K3-23871-00)
For easy assembling and maintenance,
the
drive guard bracket is welded to the
steering gate.
Interchangeability: Yes
4
(The previous model's steering gate
(8H7-
23871-00
is interchangeable,
as
a set
with
the drive guard bracket (8
F3-77316-
01L
with
the
new
steering gate).
NOTE:
------------
Due to modifications in 1, and 2. above, the
1979
model's drive guard bracket 1 (8G5-
77315-00)
and bracket 2
(8F3-77316-01)
are no longer used.
3. Drive guard
(8F3-77311-01
--+
8G8-77311-00)
Due to useofthe
new
type clutch, the
shape
of
the drive guard is changed.
'79
model
'80
model
8G8-77311-00
can be used on both
79
and
'80
models.
8F3-77311-01
can
not
be used on
'80
model.
4. Throttle
To keep the throttle cable
end, which is
held by
the
throttle lever, from contact-
Lever(8G8-421:38-00
Lever
(8J5-42138-00)
and collar (9038,7-
19aOET250
ing the
throttle
grip, a collar is mounted
and the lever
is properly curved.
Collar
(90387
·22726)
Lever
(8G8-42138-00)
can
not
be used
5. Tune-up label
(8K3-77743-00)
As an aid to service, a
tune-up
label is
attached to the intake silencer.
EI250
(BKal
SPECIFIKATIONER
1. BENSIN
2. MOTOROLJA
3. TANDSTIFT
4. ELEKTRODEAVSTAND
5. TANDINSTALLNING
6. LAoFART (BRANSLEl JUSTERINGSSKRUV
7. TOMGANGSVARVTAL
8. BRANSLENIVA
9. KEDJEHUS OWEVOLYM OCH VISKOSITET
450
cc, GEAR OLJA
10. VARITORAVSTAND
11 VARIATOR SIDOFORSKJUTNING
12. MATTSPANNING
IS;RlJd~~~~~
• FOR YTTERLIGARE INFORMATION SE
l~
DENNA MODELL.
• SPECIFIKATIONER!<AN
ANDRAS UTAN MEODELANOE.
-5
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