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CRANKSHAFT/
TRANSMISSION
SPECIFICATIONS
Shift fork I. D.
ITEM
Shift fork end thickness
Shift fork shaft O.D.
Gearshift drum O.D.
Gear I.D.
Mainshaft O.D.
Countershaft O.D.
At 13 mm
At36 mm
M4 gear
M5 gear
C1 gear
C2 gear
C3 gear
At 16.5 mm
At 19 mm
At 19.5 mm
Connecting
rod
big end side clearance
Connecting
rod
big end radial play
Crankshaft
runout at journals
TROUBLESHOOTING
Engine
noise
1. Main
journal
bearing worn
2. Crankpin bearing
worn
3.
Transmission bearing worn
Jumps out
of gear
1. Gear dogs
worn
2. Shift
fork bent
3. Shift shaft
bent
4. Shift drum stopper damaged
9-2
~
HONDA
~
MB5
STANDARD mm (in)
SERVICE
LIMIT mm
(in)
10.000-10.018
(0.3937-0.3944)
10.05
(0.396)
4.93-
5.00
(0.194-
0.197)
4.50
(0.177)
9.972-
9.987
(0.3926-0.3932)
9.95
(0.392)
12.934-
12.984
(0.5092-0.5112)
12.85
(0.506)
35.950-
35.975
(1.4154-1.4163)
35.90
( 1.413)
17.016-17.034
(0.6699-0.6 706)
17.10
(0.673)
17.016-
17.034
(0.6699-0.6706)
17.10
(0.673)
16.522-
16.543
(0.6505-0.6513)
16.60
(0.654)
19.520-
19.541
(0. 7685-o. 7693)
19.60
(0.772)
19.020-
19.041
(0. 7488-0. 7496)
19.10
(0.752)
16.966-16.984
(0.6680-0.6687)
16.93
(0.667)
16.466-
16.484
(0.6483-0.6490)
16.44
(0.647)
18.959-
18.980
(0.
7464-0.74
72)
18.93
(0.745)
19.459-1
9.480
(0. 7661-0. 7669)
19.43
(0.765)
0.15-
0.55
(0.006-
0.022)
0.85
(0.033)
-
0.05
(0.002)
-
0.10
(0.004)
Hard
shifting
1. Incorrect
clutch
adjustment
2. Shift forks bent
3.
Shift shaft bent
4. Shift spindle pawl bent or damaged
5.
Shif
t drum cam slot damaged
Date
of
Issue: July, 1981
88
©
HONDA MOTOR
CO., LTD.
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Table of Contents
Troubleshooting
