YAMAHA YZ250N, YZ250 PARTS CATALOGUE 01-1
YZ250N
(5MW1)
CANADA,U.S.A,SOUTH AFRICA
YZ250
YZ250
YZ250N
(5MW2)
(5MW3)
(5MW4)
EUROPE
OCEANIA
A
215MW–100E2
2
YZ250N/YZ250
PARTS CATALOGUE
E2001 by Yamaha Motor Co., Ltd.
1st Edition, Jun. 2001
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
A
3
A
4
FOREWORD
This Parts Catalogue is related to the parts for the model(s) in the below frame. When you are
orderingreplacementparts, please refertothis Parts Catalogueandquote both partnumbersand
part names correctly.
YZ250N(5MW1/5MW4),YZ250(5MW2/5MW3)
1. Modifications or additions which have been made after issue of the Parts
Catalogue will be announced in the Yamaha Parts News.
It is advisable that you make necessary corrections to the Parts Catalogue
according to the Yamaha Parts News.
2. Abbreviations
The Following abbreviations are used in this Parts Catalogue.
“UR” Use specified parts number.
“UN” Use as many as needed.
“AP” Alternate Parts
“LM” Local Made (Parts need to be ordered locally)
“F#” Frame No. (Applicable machine No.)
3. Parts, which are to be supplied in an assembly, are listed with a dot(.) in
front of the part name as shown below.
EXAMPLE
CARBURETOR ASSY
.JET, PILOT
.NOZZLE, MAIN
4. Number of component for assembly
The numeral appearing to the right of each component part indicates the
quantity of parts for each assembly unit.
EXAMPLE
PART NO. DESCRIPTION Q’TY REMARKS
2F5–83310–60 FRONT FLASHER LIGHT ASSY 2
115–83311–60 .BULB (6V–18W) 1
1M1–83309–60 .REFLECTOR 1
5. Applicable colors of graphics are represented in the “REMARKS” as shown
below.
PART NO. DESCRIPTION Q’TY REMARKS
2N4–24110–00–X5 FUEL TANK COMP. 1 MXR
3J1–24240–10 .GRAPHIC, FUEL TANK 1 FOR MXR
6. Applicable Serial No.
Engine Serial No. Frame Serial No.
7. Note that the illustrations for reference in finding parts numbers, not to be
used for assembling. When assembling, please use the applicable service
manual.
8. The asterisk (*) before a reference number indicates modification items
after the first edition.
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5
MODEL LABEL
A
DEEP PURPLISH BULE
DPBSE
(1) A label called “Model Label” is affixed in the location as indicated in (3) below.
When using this parts catalogue, please be sure to cross–refer the “model code –
production code No.” in the catalogue to the “model code – production code No.
“indicated on the Model Label affixed onto the product concemed.
(2) “Model Label”Indication
ab
xxxx – xxx
c
x
(3) Model Label Affixing Location
a: Model Type Code
b: Production Code No.
c: Colouring Type
4TW1–010
A
(4) Model Code – Production Code Number of Model Listed in This Parts Catalog
Model
Code
5MW1
5MW2
5MW3 010 JAPAN
5MW4
Production
Code No.
010 U.S.A.
020 CANADA
030
010 FRANCE
020 GERMANY
030 SPAIN
040 ENGLAND
050 ITALY
010 AUSTRALIA
020
Country
(destination)
SOUTH AFRICA
NEW ZEALAND
Model
Code
Production
Code No.
(destination)
Country
(5) Colouring Information
Model
Code
5MW1
5MW2
5MW3
5MW4
A
6
Colouring type
code
Colour
code
0583
Colour Name
DEEP PURPLISH BULE
SOLID E
Abbrevi-
ation
FIG. 1 CYLINDER HEAD
REF.
NO.
10 90109–05002 BOLT 2 2 2 2
11 5CU–1132A–00 VALVE 2 2 2 2 2
12 5CU–11351–10 GASKET, CYLINDER 1 1 1 1
13 90116–10314 BOLT, STUD 1 1 1 1
14 95617–10660 BOLT, STUD 1 1 1 1
PART NO. DESCRIPTION REMARKS
1 5MW–11111–00 HEAD, CYLINDER 1 1 1 1 1
2 94702–00326 PLUG, SPARK (NGK BR8EG) 1 1 1
94709–00326 PLUG, SPARK (NGK BR8EG) 1
3 90116–08394 BOLT, STUD 6 6 6 6
4 93604–08071 PIN, DOWEL 2 2 2 2
5 90176–08026 NUT, CROWN 6 6 6 6
6 90201–080L8 WASHER, PLATE 6 6 6 6
7 5MW–11311–00 CYLINDER 1 1 1 1 1
8 5CU–1131D–00 VALVE ASSY 1 1 1 1
9 5CU–1131U–10 HOLDER 3 1 1 1 1
5MW1
5MW2
5MW3
5MW4
B
15 90116–10314 BOLT, STUD 1 1 1 1
16 95617–10660 BOLT, STUD 1 1 1 1
17 99530–14016 PIN, DOWEL 2 2 2 2
18 95707–10500 NUT, FLANGE 4 4 4 4
19 93210–74316 O–RING 1 1 1 1
20 93211–02703 O–RING 1 1 1 1
21 5CU–1131E–00 HOLDER 1 1 1 1 1
22 5CU–1131P–00 HOLDER 4 1 1 1 1
23 93210–15639 O–RING 2 2 2 2
24 98507–05012 SCREW, PAN HEAD 4 4 4 4
25 90201–057H5 WASHER, PLATE 2 2 2 2
26 5CU–11830–00 LINK ASSY 1 1 1 1
2
FIG. 1 CYLINDER HEAD
REF.
NO.
27 98907–05012 SCREW, BIND 2 2 2 2
28 93104–08040 OIL SEAL 1 1 1 1
29 4SS–11832–00 LEVER, LINK 1 1 1 1
30 90508–155B8 SPRING, TORSION 2 2 2 2
31 5MW–1132E–00 PULLEY 1 1 1 1 1
32 5MW–1132F–00 PULLEY 2 1 1 1 1
33 90201–081G0 WASHER, PLATE 2 2 2 2
34 90501–046L6 SPRING, COMPRESSION 2 2 2 2
35 5CU–1131V–00 SHAFT 1 1 1 1 1
36 91317–04008 BOLT 3 3 3 3
37 5CU–11991–00 HOUSING 1 1 1 1 1
38 5CU–11993–00 GASKET 1 1 1 1
39 97007–05020 BOLT 4 4 4 4
40 92907–05600 WASHER, PLATE 4 4 4 4
41 5CU–11995–00 SEAL, HOUSING 1 1 1 1
PART NO. DESCRIPTION REMARKS
5MW1
5MW2
5MW3
5MW4
B
42 5CU–1131M–00 COVER 1 1 1 1
43 353–13115–01 CONNECTOR, SUCTION PIPE 1 1 1 1
44 5CU–11354–00 GASKET 1 1 1 1
45 98907–05016 SCREW, BIND 4 4 4 4
46 90445–09270 HOSE (L400) 1 1 1 1
3
FIG. 2 GOVERNOR
REF.
NO.
10 93300–60801 BEARING (B0060) 1 1 1 1 KOYO
11 93300–60801 BEARING (B0060) 1 1 1 1 KOYO
12 5X4–11921–02 SHAFT, GOVERNOR 1 1 1 1
13 24X–11953–01 GEAR, GOVERNOR 1 1 1 1
14 90501–256L2 SPRING, COMPRESSION 1 1 1 1
15 5CU–11952–00 PLATE 1 1 1 1
PART NO. DESCRIPTION REMARKS
1 4JY–11915–01 PLATE, THRUST 1 1 1 1 1
2 98907–05012 SCREW, BIND 1 1 1 1
3 90105–05002 BOLT, FLANGE 1 1 1 1
4 90201–057H5 WASHER, PLATE 1 1 1 1
5 90387–085E1 COLLAR 1 1 1 1
6 93104–08040 OIL SEAL 1 1 1 1
7 5CU–11990–00 PUSH ROD ASSY 1 1 1 1
8 3JE–11922–01 FORK, GOVERNOR 1 1 1 1
9 91317–04006 BOLT 2 2 2 2
5MW1
5MW2
5MW3
5MW4
B
16 90201–150U6 WASHER, PLATE 4 4 4 4
17 90387–152F2 COLLAR 1 1 1 1
18 93340–21505 BEARING 2 2 2 2
19 5CU–11912–00 RETAINER, WEIGHT 1 1 1 1
20 5CU–11911–00 RETAINER 1 1 1 1
21 93507–16020 BALL 4 4 4 4
22 93603–14240 PIN, DOWEL 1 1 1 1
23 93604–29184 PIN, DOWEL 1 1 1 1 AP FOR PUSH ROD
4
FIG. 3 CRANKSHAFT. PISTON
REF.
NO.
10 5MW–11651–00 .ROD, CONNECTING 1 1 1 1
11 93310–52406 .BEARING 1 1 1 1
12 90209–24327 .WASHER 2 2 2 2
PART NO. DESCRIPTION REMARKS
1 5MW–11631–00–A0 PISTON (STD) 1 1 1 1 UR
5MW–11631–00–B0 PISTON (STD) 1 1 1 1 UR
5MW–11631–00–C0 PISTON (STD) 1 1 1 1 UR
5MW–11631–00–D0 PISTON (STD) 1 1 1 1 UR
2 5CU–11603–10 PISTON RING SET (STD) 1 1 1 1
3 5MW–11633–00 PIN, PISTON 1 1 1 1
4 93450–19052 CIRCLIP 2 2 2 2
5 93310–218A6 BEARING 1 1 1 1
6 5MW–11400–00 CRANKSHAFT ASSY 1 1 1 1
7 5CU–11410–00 .CRANKSHAFT 1 1 1 1
8 5MW–11420–00 .CRANKSHAFT 1 1 1 1
9 5CU–11681–00 .PIN, CRANK 1 1 1 1 1
5MW1
5MW2
5MW3
5MW4
B
13 93306–37808 BEARING 1 1 1 1
14 93102–20485 OIL SEAL 1 1 1 1
15 90280–03017 KEY, WOODRUFF 1 1 1 1
16 93306–37808 BEARING 1 1 1 1
17 93102–28004 OIL SEAL 1 1 1 1
5
FIG. 4 WATER PUMP
REF.
NO.
10 5CU–12428–00 GASKET, HOUSING COVER 2 1 1 1 1
11 93604–10011 PIN, DOWEL 2 2 2 2
12 90430–06014 GASKET 1 1 1 1
13 95027–06025 BOLT, FLANGE 2 2 2 2
14 95027–06065 BOLT, FLANGE 2 2 2 2
PART NO. DESCRIPTION REMARKS
1 5CU–12459–00 GEAR, IMPELLER SHAFT 1 1 1 1
2 5DJ–12451–00 IMPELLER, WATER PUMP 1 1 1 1
3 90201–08512 WASHER, PLATE 1 1 1 1
4 93109–11073 OIL SEAL 1 1 1 1
5 93102–12106 OIL SEAL (SD 12–22–5 HS) 1 1 1 1
6 93306–00105 BEARING (B6001) 1 1 1 1
7 90201–08784 WASHER, PLATE 1 1 1 1
8 99001–06600 CIRCLIP 1 1 1 1
9 5MW–12422–00 COVER, HOUSING 1 1 1 1
5MW1
5MW2
5MW3
5MW4
B
6
FIG. 5 RADIATOR. HOSE
REF.
NO.
10 90450–28014 HOSE CLAMP ASSY 4 4 4 4
11 90450–25037 HOSE CLAMP ASSY 4 4 4 4
12 90480–15528 GROMMET 6 6 6 6
13 90387–0614M COLLAR 6 6 6 6
14 90119–06214 BOLT, WITH WASHER 6 6 6 6
PART NO. DESCRIPTION REMARKS
1 4SR–1240A–10 RADIATOR ASSY 1 1 1 1
2 91A20–05065 TUBE, FLEXIBLE VINYL 1 1 1 1
3 90467–09006 CLIP 1 1 1 1
4 4SR–12461–10 RADIATOR ASSY 1 1 1 1
5 5HD–12462–00 CAP, RADIATOR 1 1 1 1
6 5CU–12481–00 PIPE 1 1 1 1 1
7 4SS–12482–00 PIPE 2 1 1 1 1
8 5MW–12483–00 PIPE 3 1 1 1 1
9 5CU–12484–00 PIPE 4 1 1 1 1
5MW1
5MW2
5MW3
5MW4
B
7
FIG. 6 INTAKE
REF.
NO.
10 90450–51070 HOSE CLAMP ASSY 1 1 1 1
11 90450–70072 HOSE CLAMP ASSY 1 1 1 1
12 4SS–14401–10 AIR CLEANER CASE ASSY 1 1 1 1
13 5HC–14453–00 JOINT, AIR CLEANER 1 1 1 1 1
14 3JD–14459–01 HOLDER, GUIDE 1 1 1 1
15 3JD–14462–00 SEAL 1 1 1 1
PART NO. DESCRIPTION REMARKS
1 4XL–13610–00 REED VALVE ASSY 1 1 1 1
2 4XL–13613–00 .REED, VALVE 2 2 2 2
3 4XL–13616–00 .STOPPER, REED VALVE 2 2 2 2
4 98507–03008 .SCREW, PAN HEAD 4 4 4 4
5 92907–03100 .WASHER 4 4 4 4
6 4XL–13625–00 .SPACER, REED VALVE 1 1 1 1
7 5HC–13565–00 JOINT, CARBURETOR 1 1 1 1
8 91317–06020 BOLT 5 5 5 5
9 90464–06214 CLAMP 2 2 2 2
5MW1
5MW2
5MW3
5MW4
B
16 5MV–14477–00 PLATE 1 1 1 1
17 95607–05100 NUT, U 5 5 5 5
18 4SS–14417–00 COVER 1 1 1 1 1
19 90267–32070 RIVET, BLIND 3 3 3 3
20 90201–03313 WASHER, PLATE 6 6 6 6
21 4XM–14451–00 ELEMENT, AIR CLEANER 1 1 1 1
22 90209–06096 WASHER 1 1 1 1
23 90122–06035 BOLT, WING 1 1 1 1
24 3JD–14458–01 GUIDE 1 1 1 1
25 90183–06023 NUT, SPRING 4 4 4 4
26 90119–06203 BOLT, WITH WASHER 2 2 2 2
8
FIG. 7 CARBURETOR
REF.
NO.
PART NO. DESCRIPTION REMARKS
1 5MW–14101–00 CARBURETOR ASSY 1 1 1
5MW–14101–10 CARBURETOR ASSY 1 1
5MW–14101–20 CARBURETOR ASSY 1 1
2 4JT–14171–00 .PLUNGER, STARTER 1 1 1 1
3 4SR–14985–00 .FLOAT 1 1 1 1
4 4JT–14984–00 .GASKET, FLOAT CHAMBER 1 1 1 1
5 4MX–14115–00 .PLUG, SCREW 1 1 1 1
6 4MX–14561–00 .O–RING 1 1 1 1
7 4MX–14392–00 .VALVE, NEEDLE 1 1 1 1
8 4XL–14146–00 .PLATE 2 2 2 2
9 4MX–14948–07 .JET, SLOW (#50) 1 1 1 STD
4MX–14948–09 .JET, SLOW (#55) 1 STD
4SR–14948–02 .JET, SLOW (#38) 1 1 1 1 AP
4SR–14948–03 .JET, SLOW (#40) 1 1 1 1 AP
4MX–14948–04 .JET, SLOW (#42) 1 1 1 1 AP
5MW1
5MW2
5MW3
5MW4
B
4MX–14948–05 .JET, SLOW (#45) 1 1 1 1 AP
4MX–14948–06 .JET, SLOW (#48) 1 1 1 1 AP
4MX–14948–07 .JET, SLOW (#50) 1 AP
4MX–14948–08 .JET, SLOW (#52) 1 1 1 1 AP
4MX–14948–09 .JET, SLOW (#55) 1 1 1 AP
4MX–14948–10 .JET, SLOW (#58) 1 1 1 1 AP
4MX–14948–11 .JET, SLOW (#60) 1 1 1 1 AP
4MX–14948–12 .JET, SLOW (#62) 1 1 1 1 AP
10 4SR–14916–CJ .NEEDLE (N3CJ) 1 STD
4SR–14916–CW .NEEDLE (N3CW) 1 STD
4SR–14916–EJ .NEEDLE (N3EJ) 1 1 STD
4JT–14916–9G .NEEDLE (N89G) 1 1 1 1 AP
9
FIG. 7 CARBURETOR
REF.
NO.
10 4JT–14916–9H .NEEDLE (N89H) 1 1 1 1 AP
11 4MX–14919–00 .CLIP 1 1 1 1
12 5HC–14340–A7 .VALVE ASSY 1 1 1 1
13 5HC–14261–00 .HOLDER 1 1 1 1
14 5HC–14126–00 .GASKET 1 1 1 1
PART NO. DESCRIPTION REMARKS
4JT–14916–9W .NEEDLE (N89W) 1 1 1 1 AP
4JT–14916–9J .NEEDLE (N89J) 1 1 1 1 AP
4SR–14916–CG .NEEDLE (N3CG) 1 1 1 1 AP
4SR–14916–CH .NEEDLE (N3CH) 1 1 1 1 AP
4SR–14916–CJ .NEEDLE (N3CJ) 1 1 1 AP
4SR–14916–CW .NEEDLE (N3CW) 1 1 1 AP
4SR–14916–EG .NEEDLE (N3EG) 1 1 1 1 AP
4SR–14916–EH .NEEDLE (N3EH) 1 1 1 1 AP
4SR–14916–EW .NEEDLE (N3EW) 1 1 1 1 AP
4SR–14916–EJ .NEEDLE (N3EJ) 1 1 AP
5MW1
5MW2
5MW3
5MW4
B
15 4SR–14105–00 .PILOT SCREW SET 1 1 1 1
16 5HC–14131–00 .SPRING, THROTTLE VALVE 1 1 1 1
17 663–14159–00 .CLIP 1 1 1 1
18 98502–04014 .SCREW, PAN HEAD 4 4 4 4
19 4XL–14197–10 .PIPE 2 2 2 2
20 4XL–14196–10 .PIPE 1 1 1 1
21 676–14548–00 .PIN, FLOAT ARM 1 1 1 1
22 3TJ–14137–40 .CLIP 5 5 5 5
23 4MX–14943–43 .JET, MAIN (#180) 1 1 STD
4MX–14943–93 .JET, MAIN (#178) 1 1 STD
4SR–14943–90 .JET, MAIN (#162) 1 1 1 1 AP
4MX–14943–40 .JET, MAIN (#165) 1 1 1 1 AP
10
FIG. 7 CARBURETOR
REF.
NO.
23 4MX–14943–91 .JET, MAIN (#168) 1 1 1 1 AP
24 4MX–14194–00 .RING 1 1 1 1
25 98502–04012 .SCREW, PAN HEAD 2 2 2 2
26 4XL–1410E–00 .HOSE 1 1 1 1
27 4JT–1494F–07 .JET (#50) 1 1 STD
PART NO. DESCRIPTION REMARKS
4MX–14943–41 .JET, MAIN (#170) 1 1 1 1 AP
4MX–14943–92 .JET, MAIN (#172) 1 1 1 1 AP
4MX–14943–42 .JET, MAIN (#175) 1 1 1 1 AP
4MX–14943–43 .JET, MAIN (#180) 1 1 AP
4MX–14943–93 .JET, MAIN (#178) 1 1 AP
4MX–14943–94 .JET, MAIN (#182) 1 1 1 1 AP
4MX–14943–44 .JET, MAIN (#185) 1 1 1 1 AP
4MX–14943–95 .JET, MAIN (#188) 1 1 1 1 AP
4MX–14943–45 .JET, MAIN (#190) 1 1 1 1 AP
4JT–1494F–09 .JET (#55) 1 1 STD
5MW1
5MW2
5MW3
5MW4
B
4JT–1494F–09 .JET (#55) 1 1 AP
4JT–1494F–13 .JET (#65) 1 1 1 1 AP
4JT–1494F–15 .JET (#70) 1 1 1 1 AP
4JT–1494F–07 .JET (#50) 1 1 AP
4JT–1494F–11 .JET (#60) 1 1 1 1 AP
28 5HC–14146–00 .PLATE 1 1 1 1
29 98580–04006 .SCREW, PAN HEAD 1 1 1 1
30 5HC–1410H–00 .FUEL CUT SOLENOID VALVE 1 1 1 1
31 4JT–14147–00 .O–RING 1 1 1 1
32 5HC–14264–00 .COLLAR 1 1 1 1
33 5HC–14275–00 .SPRING 1 1 1 1
34 5HC–14922–00 .SCREW, THROTTLE 1 1 1 1
11
FIG. 7 CARBURETOR
REF.
NO.
35 5HC–14934–00 .SPRING, THROTTLE STOP 1 1 1 1
36 5HC–14208–00 .LEVER COMP. 1 1 1 1 1
37 5HC–14216–00 .SCREW 2 2 2 2
38 5HC–85885–00 .THROTTLE SENSOR ASSY 1 1 1 1
39 5BE–14449–00 .COLLAR 1 1 1 1
40 5BE–14562–00 .O–RING 1 1 1 1
41 4YR–14216–00 .SCREW 2 2 2 2
42 4YR–14557–00 .WASHER 2 2 2 2
PART NO. DESCRIPTION REMARKS
5MW1
5MW2
5MW3
5MW4
B
12
FIG. 8 EXHAUST
REF.
NO.
10 90119–06192 BOLT, WITH WASHER 1 1 1 1
11 95027–06025 BOLT, FLANGE 1 1 1 1
12 95027–08012 BOLT, FLANGE 1 1 1 1
13 90201–08730 WASHER, PLATE 1 1 1 1
14 3JE–14615–01 JOINT, EXHAUST 1 1 1 1 1
PART NO. DESCRIPTION REMARKS
1 5MW–14610–00 EXHAUST PIPE ASSY 1 1 1 1 1 UR
5MW–14610–10 EXHAUST PIPE ASSY 1 1 UR FOR USA
2 5MW–14642–00 SEAL, EXHAUST 2 2 2 2
3 90507–20052 SPRING, TENSION 2 2 2 2
4 5CU–14771–00 STAY, MUFFLER 1 1 1 1 1
5 90480–16561 GROMMET 1 1 1 1
6 90387–063G3 COLLAR 1 1 1 1
7 90201–06071 WASHER, PLATE 1 1 1 1
8 483–14781–02 STAY, MUFFLER 2 1 1 1 1
9 95027–06012 BOLT, FLANGE 1 1 1 1
5MW1
5MW2
5MW3
5MW4
B
15 5HC–14753–00 SILENCER, EXHAUST 1 1 1 1 UR
5MW–14753–10 SILENCER, EXHAUST 1 UR FOR USA
16 92017–06010 .BOLT, BUTTON HEAD 2 2 2 2
17 5CU–1469A–00 .FIBER 1 1 1 1 UR
5HC–1469A–10 .FIBER 1 UR FOR USA
18 90480–16561 GROMMET 2 2 2 2
19 90387–063G3 COLLAR 2 2 2 2
20 95027–06025 BOLT, FLANGE 1 1 1 1
21 90201–06071 WASHER, PLATE 1 1 1 1
13
FIG. 9 CRANKCASE
REF.
NO.
10 5CU–15454–00 GASKET, AIR CLEANER COVER 1 1 1 1 1
11 93612–16254 PIN, DOWEL 2 2 2 2
12 90387–1712Y COLLAR 2 2 2 2
13 4L0–17471–00 PLATE, COVER 1 1 1 1
14 90157–06077 SCREW, PAN HEAD 2 2 2 2
15 4V4–15118–00 HOLDER 1 1 1 1
PART NO. DESCRIPTION REMARKS
1 5CU–15111–01 CRANKCASE 1 1 1 1 1
2 5CU–15121–01 CRANKCASE 2 1 1 1 1
3 91317–06050 BOLT 7 7 7 7
4 91317–06060 BOLT 1 1 1 1
5 91317–06070 BOLT 3 3 3 3
6 4JT–15381–01 PLATE, BEARING COVER 2 2 2 2
7 90149–06326 SCREW 2 2 2 2
8 353–13115–01 CONNECTOR, SUCTION PIPE 1 1 1 1
9 90445–08605 HOSE 1 1 1 1
5MW1
5MW2
5MW3
5MW4
B
16 5CU–15118–00 HOLDER 1 1 1 1
17 90105–06556 BOLT, FLANGE 2 2 2 2
18 90340–12059 PLUG, STRAIGHT SCREW 1 1 1 1
19 90430–12227 GASKET 1 1 1 1
14
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