Yamaha YZ125K1 User Manual
YZ125K1
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YZ125K1
A2
YZ125K1
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YZ125K1
A4
CYLINDER HEAD
Ref. Part
No. Number Description Qty Remarks
1 4JY-11111-01-00 HEAD, CYLINDER 1 . . . . . . . . . 1
2 90116-08394-00 BOLT, STUD . . . . . . . . . . . . . . 5
3 90176-08026-00 NUT, CROWN . . . . . . . . . . . . . 5
4 90201-08087-00 WASHER, PLATE . . . . . . . . . . . 5
5 93210-63442-00 O-RING . . . . . . . . . . . . . . . . . . 1
6 93210-90785-00 O-RING . . . . . . . . . . . . . . . . . . 1
7 4SS-11311-10-00 CYLINDER 1 . . . . . . . . . . . . . . 1
8 5DH-11351-00-00 GASKET, CYLINDER . . . . . . . . 1
9 90116-08318-00 BOLT, STUD . . . . . . . . . . . . . . 2
10 90116-08388-00 BOLT, STUD . . . . . . . . . . . . . . 2
11 99530-10114-00 PIN, DOWEL . . . . . . . . . . . . . . 2
12 90179-08299-00 NUT . . . . . . . . . . . . . . . . . . . . . 4
13 NGK-BR9EG-00-00 PLUG, SPARK (NGK BR9EG) . 1
14 4SS-1131A-02-00 VALVE 1 . . . . . . . . . . . . . . . . . 1
15 4SS-1132A-02-00 VALVE 2 . . . . . . . . . . . . . . . . . 1
16 4JY-1131E-00-00 HOLDER 1 . . . . . . . . . . . . . . . . 2
17 98907-05010-00 SCREW, BIND . . . . . . . . . . . . . 2
18 90201-057H5-00 WASHER, PLATE . . . . . . . . . . . 2
19 4SS-1131V-00-00 SHAFT 1 . . . . . . . . . . . . . . . . . 1
20 4SS-11832-00-00 LEVER, LINK . . . . . . . . . . . . . . 1
21 91317-04008-00 BOLT . . . . . . . . . . . . . . . . . . . . 1
22 93604-18251-00 PIN, DOWEL . . . . . . . . . . . . . . 2
23 93104-08040-00 OIL SEAL . . . . . . . . . . . . . . . . . 1
24 4SS-1131M-00-00 COVER . . . . . . . . . . . . . . . . . . 1
25 4JY-11166-00-00 PIPE, BREATHER 1 . . . . . . . . . 1
26 90467-13062-00 CLIP . . . . . . . . . . . . . . . . . . . . 1
27 4JY-11354-02-00 GASKET . . . . . . . . . . . . . . . . . 1
28 98907-05016-00 SCREW, BIND . . . . . . . . . . . . . 4
29 90508-161B3-00 SPRING, TORSION . . . . . . . . . 2
YZ125K1
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CONTINUED ON NEXT FRAME
➤
CYLINDER HEAD
Ref. Part
No. Number Description Qty Remarks
30 90387-08785-00 COLLAR . . . . . . . . . . . . . . . . . 2
31 4JY-11991-01-00 HOUSING 1 . . . . . . . . . . . . . . . 1
32 4JY-11993-01-00 . GASKET . . . . . . . . . . . . . . . . 1
33 97007-05016-00 BOLT . . . . . . . . . . . . . . . . . . . . 4
34 92907-05600-00 WASHER, PLATE . . . . . . . . . . . 4
35 4JY-11995-00-00 SEAL, HOUSING . . . . . . . . . . . 1
YZ125K1
A6
GOVERNOR
Ref. Part
No. Number Description Qty Remarks
1 4JY-11915-01-00 PLATE, THRUST 1 . . . . . . . . . . 1
2 98507-05012-00 SCREW, PAN HEAD . . . . . . . . 1
3 4SS-11990-00-00 PUSH ROD ASSEMBLY . . . . . . 1
4 90387-085E1-00 COLLAR . . . . . . . . . . . . . . . . . 1
5 90201-057H5-00 WASHER, PLATE . . . . . . . . . . . 1
6 97007-05012-00 BOLT . . . . . . . . . . . . . . . . . . . . 1
7 93104-08040-00 OIL SEAL . . . . . . . . . . . . . . . . . 1
8 3JE-11922-01-00 FORK, GOVERNOR . . . . . . . . . 1
9 91317-04006-00 BOLT . . . . . . . . . . . . . . . . . . . . 2
10 93300-60801-00 BEARING (B0060) . . . . . . . . . . 2 KOYO
11 5X4-11921-02-00 SHAFT, GOVERNOR . . . . . . . . 1
12 24X-11953-01-00 GEAR, GOVERNOR . . . . . . . . . 1
13 90560-08213-00 SPACER . . . . . . . . . . . . . . . . . 1
14 90501-30742-00 SPRING, COMPRESSION . . . . . 1
15 5X4-11952-00-00 PLATE . . . . . . . . . . . . . . . . . . . 1
16 90201-151A7-00 WASHER, PLATE (T=1.0) . . . . . 4
17 90387-152F2-00 COLLAR . . . . . . . . . . . . . . . . . 1
18 93340-21505-00 BEARING . . . . . . . . . . . . . . . . . 2
19 5X5-11912-01-00 RETAINER, WEIGHT . . . . . . . . 1
20 5X5-11911-01-00 RETAINER . . . . . . . . . . . . . . . . 1
21 93521-64032-00 BALL . . . . . . . . . . . . . . . . . . . . 4
22 93603-14240-00 PIN, DOWEL . . . . . . . . . . . . . . 1
23 90387-107T9-00 COLLAR . . . . . . . . . . . . . . . . . 1 AP
YZ125K1
A7
CRANKSHAFT - PISTON
Ref. Part
No. Number Description Qty Remarks
1 5DH-11400-00-00 CRANKSHAFT ASSEMBLY . . . 1
2 4SS-11410-10-00 . CRANKSHAFT . . . . . . . . . . . . 1
3 4SS-11420-00-00 . CRANKSHAFT . . . . . . . . . . . . 1
4 4PE-11651-02-00 . ROD, CONNECTING . . . . . . . . 1
5 3JD-11681-02-00 . PIN, CRANK 1 . . . . . . . . . . . . 1
6 90209-22071-00 . WASHER . . . . . . . . . . . . . . . . 2
7 93310-522P7-00 . BEARING . . . . . . . . . . . . . . . . 1
8 4XM-11631-10-A0 PISTON . . . . . . . . . . . . . . . . . . 1
4XM-11631-10-B0 PISTON . . . . . . . . . . . . . . . . . . 1
4XM-11631-10-C0 PISTON . . . . . . . . . . . . . . . . . . 1
4XM-11631-10-D0 PISTON . . . . . . . . . . . . . . . . . . 1
9 4JY-11611-00-00 RING, PISTON . . . . . . . . . . . . . 1
10 4XM-11633-10-00 PIN, PISTON . . . . . . . . . . . . . . 1
11 93450-16068-00 CIRCLIP . . . . . . . . . . . . . . . . . . 2
12 93310-315S4-00 BEARING . . . . . . . . . . . . . . . . . 1
13 93306-37204-00 BEARING (63/22SH2-9TC4) . . . 2 KOYO
14 93102-22363-00 OIL SEAL . . . . . . . . . . . . . . . . . 1
15 93103-32183-00 OIL SEAL . . . . . . . . . . . . . . . . . 1
16 90280-03045-00 KEY, WOODRUFF . . . . . . . . . . 1
YZ125K1
A8
WATER PUMP
Ref. Part
No. Number Description Qty Remarks
1 5DH-12459-00-00 GEAR, IMPELLER SHAFT . . . . 1
2 5DH-12451-00-00 IMPELLER, WATER PUMP . . . . 1
3 99001-06600-00 CIRCLIP . . . . . . . . . . . . . . . . . . 1
4 90201-083P5-00 WASHER, PLATE . . . . . . . . . . . 1
5 90201-08784-00 WASHER, PLATE . . . . . . . . . . . 1
6 93109-11073-00 OIL SEAL . . . . . . . . . . . . . . . . . 1
7 93102-12106-00 OIL SEAL (SD 12-22-5 HS) . . . . 1
8 93306-00105-00 BEARING (B6001) . . . . . . . . . . 1
9 4JY-12422-00-00 COVER, HOUSING . . . . . . . . . . 1
10 4JY-12428-00-00 GASKET, HOUSING COVER 2 . 1
11 93604-10011-00 PIN, DOWEL . . . . . . . . . . . . . . 2
12 95027-06065-00 BOLT, FLANGE . . . . . . . . . . . . 2
13 95027-06030-00 BOLT, FLANGE . . . . . . . . . . . . 2
14 90430-06014-00 GASKET . . . . . . . . . . . . . . . . . 1
15 95027-06010-00 BOLT, FLANGE . . . . . . . . . . . . 1
YZ125K1
A9
RADIATOR - HOSE
Ref. Part
No. Number Description Qty Remarks
1 4SS-1240A-00-00 RADIATOR ASSEMBLY . . . . . . 1
2 91A20-05065-00 TUBE, FLEXIBLE VINYL . . . . . 1
3 90467-09006-00 CLIP . . . . . . . . . . . . . . . . . . . . 1
4 4SS-12461-00-00 RADIATOR ASSEMBLY . . . . . . 1
5 22W-12462-00-00 CAP, RADIATOR . . . . . . . . . . . 1
6 4SS-12481-00-00 PIPE 1 . . . . . . . . . . . . . . . . . . . 1
7 4SS-12482-00-00 PIPE 2 . . . . . . . . . . . . . . . . . . . 1
8 4SS-12483-00-00 PIPE 3 . . . . . . . . . . . . . . . . . . . 1
9 4SS-12484-00-00 PIPE 4 . . . . . . . . . . . . . . . . . . . 1
10 90450-28014-00 HOSE CLAMP ASSY . . . . . . . . 4
11 90450-22017-00 HOSE CLAMP ASSY . . . . . . . . 2
12 90467-21068-00 CLIP . . . . . . . . . . . . . . . . . . . . 1
13 90450-25037-00 HOSE CLAMP ASSY . . . . . . . . 1
14 90480-15528-00 GROMMET . . . . . . . . . . . . . . . . 6
15 90387-0700G-00 COLLAR . . . . . . . . . . . . . . . . . 6
16 95027-06030-00 BOLT, FLANGE . . . . . . . . . . . . 6
17 90201-06071-00 WASHER, PLATE . . . . . . . . . . . 6
YZ125K1
A10
INTAKE
Ref. Part
No. Number Description Qty Remarks
1 4SS-13610-00-00 REED VALVE ASSY . . . . . . . . . 1
2 4SS-13613-00-00 . REED, VALVE . . . . . . . . . . . . 2
3 4JY-13616-00-00 . STOPPER, REED VALVE . . . . 2
4 98507-03008-00 . SCREW, PAN HEAD . . . . . . . 4
5 92907-03100-00 . WASHER . . . . . . . . . . . . . . . . 4
6 4PE-13565-00-00 JOINT, CARBURETOR . . . . . . . 1
7 95027-06020-00 BOLT, FLANGE . . . . . . . . . . . . 4
8 90450-51070-00 HOSE CLAMP ASSEMBLY . . . 1
9 90450-70072-00 HOSE CLAMP ASSEMBLY . . . 1
10 4SS-14401-02-00 AIR CLEANER CASE
ASSEMBLY . . . . . . . . . . . . . . . 1
11 4SS-14453-00-00 JOINT, AIR CLEANER 1 . . . . . . 1
12 3JD-14459-01-00 HOLDER, GUIDE . . . . . . . . . . . 1
13 3JD-14462-00-00 SEAL . . . . . . . . . . . . . . . . . . . . 1
14 3JD-14477-00-00 PLATE . . . . . . . . . . . . . . . . . . . 1
15 95607-05100-00 NUT, U . . . . . . . . . . . . . . . . . . . 5
16 4SS-14417-00-00 COVER 1 . . . . . . . . . . . . . . . . . 1
17 90267-32070-00 RIVET, BLIND . . . . . . . . . . . . . 3
18 90201-03313-00 WASHER, PLATE . . . . . . . . . . . 6
19 4XM-14451-00-00 ELEMENT, AIR CLEANER . . . . 1
20 90209-06096-00 WASHER . . . . . . . . . . . . . . . . . 1
21 90122-06035-00 BOLT, WING . . . . . . . . . . . . . . 1
22 3JD-14458-01-00 GUIDE . . . . . . . . . . . . . . . . . . . 1
23 90183-06023-00 NUT, SPRING . . . . . . . . . . . . . . 4
24 90201-061A5-00 WASHER, PLATE . . . . . . . . . . . 2
25 90105-06553-00 BOLT, WASHER BASED . . . . . 2
YZ125K1
A11
CARBURETOR
Ref. Part
No. Number Description Qty Remarks
1 5DH-14101-10-00 CARBURETOR ASSEMBLY 1 . 1
2 4PE-14261-01-00 . HOLDER . . . . . . . . . . . . . . . . 1
3 4PE-14194-00-00 . RING . . . . . . . . . . . . . . . . . . . 1
4 256-14919-00-00 . CLIP . . . . . . . . . . . . . . . . . . . 1
5 3JE-14171-00-00 . PLUNGER, STARTER . . . . . . 1
6 3JD-14104-00-00 . AIR SCREW SET . . . . . . . . . . 1
7 1FN-14565-00-00 . SCREW . . . . . . . . . . . . . . . . . 1
8 4PE-14243-00-00 . PLATE . . . . . . . . . . . . . . . . . . 1
9 98507-04008-00 . SCREW, PAN HEAD . . . . . . . 1
10 353-14186-00-00 . PIN, FLOAT . . . . . . . . . . . . . . 1
11 4PE-14107-38-00 . NEEDLE VALVE SET . . . . . . . 1
12 98507-04012-00 . SCREW, PAN HEAD . . . . . . . 3
13 4PE-14131-00-00 . SPRING, THROTTLE VALVE . 1
14 4PE-14103-00-00 . THROTTLE SCREW SET . . . . 1
15 2HH-14197-00-00 . PIPE . . . . . . . . . . . . . . . . . . . 2
16 3X3-14197-00-00 . PIPE, AIR VENT . . . . . . . . . . . 1
17 4PE-14185-00-00 . FLOAT . . . . . . . . . . . . . . . . . . 1
18 3JE-14561-00-00 . O-RING . . . . . . . . . . . . . . . . . 1
19 3XK-14115-00-00 . PLUG, SCREW . . . . . . . . . . . . 1
20 5A0-14116-F0-00 . NEEDLE (6BEF16-67) . . . . . . . 1 AP
5A0-14116-F1-00 . NEEDLE (6BEF16-68) . . . . . . . 1 AP
5A0-14116-F2-00 . NEEDLE (6BEF16-69) . . . . . . . 1 STD
5A0-14116-F3-00 . NEEDLE (6BEF16-70) . . . . . . . 1 AP
5A0-14116-F4-00 . NEEDLE (6BEF16-71) . . . . . . . 1 AP
21 4KM-14142-40-00 . JET, PILOT (# 40) . . . . . . . . . 1 AP
4KM-14142-45-00 . JET, PILOT (# 45) . . . . . . . . . 1 STD
4KM-14142-50-00 . JET, PILOT (# 50) . . . . . . . . . 1 AP
4KM-14142-55-00 . JET, PILOT (# 55) . . . . . . . . . 1 AP
4KM-14142-60-00 . JET, PILOT (# 60) . . . . . . . . . 1 AP
YZ125K1
A12
CONTINUED ON NEXT FRAME
➤
CARBURETOR
Ref. Part
No. Number Description Qty Remarks
21 4KM-14142-65-00 . JET, PILOT (# 65) . . . . . . . . . 1 AP
22 137-14143-66-00 . JET, MAIN (#330) . . . . . . . . . . 1 AP
137-14143-68-00 . JET, MAIN (#340) . . . . . . . . . . 1 AP
137-14143-70-00 . JET, MAIN (350) . . . . . . . . . . . 1 STD
137-14143-72-00 . JET, MAIN (360) . . . . . . . . . . . 1 AP
137-14143-74-00 . JET, MAIN (370) . . . . . . . . . . . 1 AP
23 3TC-14141-S5-00 . NOZZLE, MAIN (S-5) . . . . . . . 1 AP
3TC-14141-S6-00 . NOZZLE, MAIN (S-6) . . . . . . . 1 AP
3TC-14141-S7-00 . NOZZLE, MAIN (S-7) . . . . . . . 1 AP
3TC-14141-S8-00 . NOZZLE, MAIN (S-8) . . . . . . . 1 AP
3TC-14141-S9-00 . NOZZLE, MAIN (S-9) . . . . . . . 1 STD
3TC-14141-T0-00 . NOZZLE, MAIN (T-0) . . . . . . . 1 AP
24 4SS-14112-45-00 . VALVE, THROTTLE (C.A.4.5) . 1 AP
4SS-14112-50-00 . VALVE, THROTTLE (C.A.5.0) . 1 STD
4SS-14112-55-00 . VALVE, THROTTLE (C.A.5.5) . 1 AP
25 4PE-1416A-00-00 . O-RING . . . . . . . . . . . . . . . . . 1
26 4PE-14147-00-00 . O-RING . . . . . . . . . . . . . . . . . 1
27 4PE-14197-00-00 . PIPE, AIR VENT . . . . . . . . . . . 2
28 87M-14137-00-00 . CLIP . . . . . . . . . . . . . . . . . . . 3
YZ125K1
B1
EXHAUST
Ref. Part
No. Number Description Qty Remarks
1 4XM-14610-00-00 EXHAUST PIPE ASSEMBLY 1 . 1
2 93210-42728-00 O-RING . . . . . . . . . . . . . . . . . . 2
3 90507-20052-00 SPRING, TENSION . . . . . . . . . . 2
4 565-14771-00-00 STAY, MUFFLER 1 . . . . . . . . . . 2
5 90387-062W7-00 COLLAR . . . . . . . . . . . . . . . . . 1
6 95027-06045-00 BOLT, FLANGE . . . . . . . . . . . . 1
7 90201-06060-00 WASHER, PLATE . . . . . . . . . . . 1
8 95027-06012-00 BOLT, FLANGE . . . . . . . . . . . . 2
9 90119-06185-00 BOLT, WITH WASHER . . . . . . . 1
10 4JY-14615-00-00 JOINT, EXHAUST 1 . . . . . . . . . 1
11 5DH-14753-00-00 SILENCER, EXHAUST . . . . . . . 1
12 4SR-1469A-00-00 . FIBER . . . . . . . . . . . . . . . . . . 1
13 92017-06010-00 . BOLT, BUTTON HEAD . . . . . . 2
14 95027-06025-00 BOLT, FLANGE . . . . . . . . . . . . 1
15 90201-06071-00 WASHER, PLATE . . . . . . . . . . . 1
16 90387-063G3-00 COLLAR . . . . . . . . . . . . . . . . . 2
17 90480-16561-00 GROMMET . . . . . . . . . . . . . . . . 2
YZ125K1
B2
CRANKCASE
Ref. Part
No. Number Description Qty Remarks
1 5DH-15111-00-00 CRANKCASE 1 . . . . . . . . . . . . 1
2 353-13115-01-00 CONNECTOR, SCTN PPE . . . . 1
3 90445-08605-00 HOSE . . . . . . . . . . . . . . . . . . . . 1
4 93612-16254-00 PIN, DOWEL . . . . . . . . . . . . . . 2
5 5DH-15121-00-00 CRANKCASE 2 . . . . . . . . . . . . 1
6 90387-1712Y-00 COLLAR . . . . . . . . . . . . . . . . . 2
7 90340-12059-00 PLUG, STRAIGHT SCREW . . . . 1
8 90430-12227-00 GASKET . . . . . . . . . . . . . . . . . 1
9 91317-06045-00 BOLT . . . . . . . . . . . . . . . . . . . . 4
10 91317-06055-00 BOLT . . . . . . . . . . . . . . . . . . . . 6
11 91317-06070-00 BOLT . . . . . . . . . . . . . . . . . . . . 2
12 90461-10136-00 CLAMP . . . . . . . . . . . . . . . . . . 1
13 3R4-15118-00-00 HOLDER . . . . . . . . . . . . . . . . . 1
14 90105-06556-00 BOLT, WASHER BASED . . . . . 1
15 99590-17016-00 PIN, DOWEL . . . . . . . . . . . . . . 1
16 93210-16314-00 O-RING . . . . . . . . . . . . . . . . . . 1
YZ125K1
B3
CRANKCASE COVER 1
Ref. Part
No. Number Description Qty Remarks
1 4JY-15411-00-00 COVER, CRANKCASE 1 . . . . . 1
2 4JY-15451-01-00 GASKET, CRANKCASE
COVER 1 . . . . . . . . . . . . . . . . . 1
3 98507-06030-00 SCREW, PAN HEAD . . . . . . . . 5
4 92907-06600-00 WASHER, PLATE . . . . . . . . . . . 5
5 4EX-15421-00-00 COVER, CRANKCASE 2 . . . . . 1
6 98507-06016-00 SCREW, PAN HEAD . . . . . . . . 2
7 4JY-15431-10-00 COVER, CRANKCASE 3 . . . . . 1
8 4JY-15462-00-00 GASKET, CRANKCASE
COVER 3 . . . . . . . . . . . . . . . . . 1
9 99530-10114-00 PIN, DOWEL . . . . . . . . . . . . . . 2
10 3Y1-15363-00-00 PLUG, OIL . . . . . . . . . . . . . . . . 1
11 93210-19123-00 O-RING . . . . . . . . . . . . . . . . . . 1
12 95027-06010-00 BOLT, FLANGE . . . . . . . . . . . . 1
13 90430-06014-00 GASKET . . . . . . . . . . . . . . . . . 1
14 95027-06030-00 BOLT, FLANGE . . . . . . . . . . . . 6
15 95027-06040-00 BOLT, FLANGE . . . . . . . . . . . . 2
16 4JY-15415-00-00 COVER, GENERATOR . . . . . . . 1
17 4JY-15463-01-00 GASKET, CARBURETOR
COVER 2 . . . . . . . . . . . . . . . . . 1
18 93604-10011-00 PIN, DOWEL . . . . . . . . . . . . . . 2
19 95027-06025-00 BOLT, FLANGE . . . . . . . . . . . . 6
YZ125K1
B4
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