SERVICE INFORMATION. Honda CBR125R

CRANKSHAFT/BALANCER/TRANSMISSION

SERVICE INFORMATION

GENERAL

• This section covers crankcase separation for service of the crankshaft, transmission and balancer.

• The crankcase must be separated to service the crankshaft, balancer and transmission. To service these parts, the engine must be removed from the frame.

• The following components must be removed before separating the crankcase.

– Camshaft (page 8-8)

– Cylinder head (page 8-15)

– Cylinder/piston (page 9-4)

– Clutch (page 10-9)

– Gearshift linkage (page 10-15)

– Oil pump (page 4-4)

– Primary drive gear (page 10-20)

– Flywheel (page 11-7)

– Neutral switch (page 19-17)

– Starter motor (page 18-6)

– Engine (page 7-4)

• Be careful not to damage the crankcase mating surfaces when servicing.

• Clean the oil passages before assembling the crankcase halves.

• Prior to assembling the crankcase halves, apply sealant to their mating surfaces. Wipe off excess sealant thoroughly.

SPECIFICATIONS

Crankshaft

Transmission

Shift fork, shift fork shaft

Shift drum

Runout

ITEM

Connecting rod big end radial clearance

Connecting rod big end side clearance

Gear I.D.

M5, M6

C1

C2

Bushing O.D.

Gear-to-bushing clearance

C3, C4

M5, M6

C1

C2

M5, M6, C1

C2

Bushing I.D.

Mainshaft / countershaft O.D.

M5

C1

C2 at M5 bushing at C1 bushing at C2 bushing

Bushing-to-shaft clearance

M5, C1

C2

Shift fork shaft O.D.

Shift fork I.D.

Shift fork claw thickness

Shift drum O.D.

Right side

Shift drum journal

I.D.

Left side

Right side

Left side

Right side Shift drum-to-shift drum journal clearance

Left side

STANDARD

–

0.006 – 0.014 (0.0002 – 0.0006)

0.40 – 0.60 (0.016 – 0.024)

20.000 – 20.021 (0.7874 – 0.7882)

18.000 – 18.021 (0.7087 – 0.7095)

23.020 – 23.041 (0.9063 – 0.9071)

22.020 – 22.041 (0.8669 – 0.8678)

19.959 – 19.980 (0.7858 – 0.7866)

17.959 – 17.980 (0.7070 – 0.7079)

22.984 – 23.005 (0.9049 – 0.9057)

0.020 – 0.062 (0.0008 – 0.0024)

0.015 – 0.057 (0.0006 –0.0022)

17.000 – 17.018 (0.6693 – 0.6700)

15.000 – 15.018 (0.5906 – 0.5913)

20.020 – 20.041 (0.7882 – 0.7890)

16.966 – 16.984 (0.6680 – 0.6687)

14.966 – 14.984 (0.5892 – 0.5899)

19.978 – 19.989 (0.7865 – 0.7870)

0.016 – 0.052 (0.0006 – 0.0020)

0.031 – 0.063 (0.0012 – 0.0025)

9.986 – 9.995 (0.3931 – 0.3935)

10.000 – 10.018 (0.3937 – 0.3944)

4.93 – 5.00 (0.194 – 0.197)

25.959 – 25.980 (1.0220 – 1.0228)

24.959 – 24.980 (0.9826 – 0.9835)

26.000 – 26.021 (1.0236 – 1.0244)

25.000 – 25.033 (0.9843 – 0.9855)

0.020 – 0.062 (0.0008 – 0.0024)

0.020 – 0.074 (0.0008 – 0.0029)

Unit: mm (in)

SERVICE LIMIT

0.03 (0.001)

0.05 (0.002)

0.85 (0.033)

20.05 (0.789)

18.07 (0.711)

23.09 (0.909)

22.10 (0.870)

19.91 (0.784)

17.90 (0.705)

22.47 (0.885)

0.10 (0.004)

0.10 (0.004)

17.04 (0.671)

15.10 (0.594)

20.10 (0.791)

16.93 (0.667)

14.90 (0.587)

19.92 (0.784)

0.10 (0.004)

0.10 (0.004)

9.93 (0.391)

10.03 (0.395)

4.82 (0.190)

25.90 (1.020)

24.90 (0.980)

26.50 (1.043)

25.50 (1.004)

0.07 (0.003)

0.08 (0.003)

12-3

CRANKSHAFT/BALANCER/TRANSMISSION

TOOLS

Bearing remover head, 12 mm

07936-1660110

Bearing remover shaft, 12 mm

07936-1660120

Bearing remover head, 15 mm

07936-KC10200

Bearing remover shaft

07936-KC10100

Remover weight

07741-0010201

Driver

07749-0010000

Pilot, 12 mm

07746-0040200

Pilot, 15 mm

07746-0040300

Pilot, 17 mm

07746-0040400

Pilot, 20 mm

07746-0040500

Pilot, 35 mm

07746-0040800

Attachment, 32 x 35 mm

07746-0010100

12-4