Gear Box |
|
Description |
Dimensions |
Maximum Wear |
Low gear wheel bushes internal diameter |
0.625" + 0.0007" -0.0005" |
|
Wear -
maximum clearance between bush and shaft |
|
0.006 |
Lay shaft bush internal diameter |
0.8125 +0.0007" -0.0005" |
|
Wear-
maximum clearance between bush and shaft |
|
0.006 |
Lay shaft end float |
0.005 (optimum) 0.015" |
|
Main shaft end float |
0.005 (optimum) 0.010 |
|
Selector fork thickness |
0.245" |
|
Selector fork grove width |
0.257 |
|
Maximum clearance selector fork to grove |
- |
0.020 |
Measurement between selector fork prongs |
1.213 |
|
Selector Fork peg diameter |
0.270 |
|
Selector rod diameter |
0.375 |
0.004 |
K191 Kick Start Thrust Pins |
0.5625 X 0.1875 |
- |
C6/3 Back Plate Clutch Thrust Pins |
0.453 X 0.1875 |
- |
C30 Clutch Operating Thrust Pin Length |
1.343 or 1.328 |
|
B22/2 & B23 bearing wear - radial - axial |
|
0.004 0.006 |
B22 - radial - axial |
|
0.004 0.005 |
Shaft to bearing interference fit |
0.001 |
|
Viewed from kick starter to clutch end of gearbox
Gear |
1st |
3rd |
2nd |
4th |
Gearshaft pinion teeth |
26 |
19 |
22 |
16 |
Layshaft pinion teeth |
18 |
25 |
22 |
28 |
Gear |
1st |
3rd |
2nd |
4th |
Gearshaft pinion teeth |
26 |
19 |
22 |
17 |
Layshaft pinion teeth |
18 |
25 |
22 |
27 |
Gear |
1st |
3rd |
2nd |
4th |
Gearshaft pinion teeth |
25 |
19 |
22 |
18 |
Layshaft pinion teeth |
19 |
25 |
22 |
26 |
Gearbox Prefix 11 |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
MAC |
21T |
14.1 |
9.6 |
7.3 |
5.5 |
Gearbox Prefix 12 |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
12 (MSS to 55, VM |
18T |
11.24 |
7.78 |
5.91 |
4.9 |
|
20T |
10.1 |
6.97 |
5.3 |
4.4 |
|
19T |
10.65 |
7.36 |
5.6 |
4.63 |
|
17T |
11.91 |
8.23 |
5.27 |
5.18 |
|
16T |
12.62 |
8.73 |
6.64 |
5.5 |
Gearbox Prefix 14 |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
MSS |
18T |
12.4 |
8.57 |
6.52 |
4.9 |
|
20T |
11.18 |
7.74 |
5.98 |
4.4 |
|
19T |
11.76 |
8.15 |
6.30 |
4.63 |
|
17T |
13.16 |
9.17 |
7.05 |
5.18 |
|
16T |
13.91 |
9.68 |
7.32 |
5.5 |
Gearbox Prefix 12 |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
Viper |
21T |
12.62 |
8.73 |
6.64 |
5.5 |
|
20T |
13.25 |
9.16 |
6.97 |
5.76 |
|
19T |
13.94 |
9.64 |
7.33 |
6.06 |
|
18T |
14.72 |
10.18 |
7.74 |
6.40 |
Gearbox Prefix 12R |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
Venom Clubman |
18T |
9.25 |
7.03 |
5.35 |
4.9 |
|
20T |
8.36 |
6.34 |
4.84 |
4.4 |
|
19T |
8.80 |
6.67 |
5.09 |
4.63 |
|
17T |
9.84 |
9.64 |
7.33 |
6.06 |
|
16T |
10.45 |
10.18 |
7.74 |
6.40 |
Gearbox Prefix 12R |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
Viper Clubman |
21T |
10.45 |
7.94 |
6.03 |
5.5 |
|
20T |
10.94 |
8.29 |
6.34 |
5.76 |
|
19T |
11.54 |
8.73 |
6.67 |
6.06 |
|
18T |
12.16 |
9.22 |
7.04 |
6.40 |
Gearbox Prefix 12 |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
Thruxton |
20T |
10.1 |
6.97 |
5.3 |
4.4 |
|
21T |
9.66 |
6.68 |
5.08 |
4.2 |
|
19T |
10.65 |
7.36 |
5.6 |
4.63 |
|
18T |
11.24 |
7.78 |
5.91 |
4.9 |
|
17T |
11.91 |
8.23 |
5.27 |
5.18 |
Gearbox Prefix 12R |
Sprocket |
First Gear |
Second Gear |
Third Gear |
Fourth Gear |
Thruxton |
20T |
8.4 |
6.3 |
4.83 |
4.4 |
|
19T |
8.80 |
6.67 |
5.09 |
4.63 |
|
18T |
9.25 |
7.03 |
5.35 |
4.9 |
|
17T |
9.84 |
9.64 |
7.33 |
6.06 |
|
16T |
10.45 |
10.18 |
7.74 |
6.40 |
Chains and Sprockets
Model |
MAC |
Viper C/man |
Viper |
MSS |
Venom |
Venom C/man |
Thruxton |
Primary chain pitches 0.5-in. pitch; .305-in. wide; 335-in. roller dia. |
67 |
67 |
67 |
68 |
68 |
68 |
68 |
Rear chain pitches .625 in pitch; .380-in wide; .335-in. roller dia. |
|
|
|
101 |
101 |
101 |
101 |
Rear chain pitches .5-in. pitch; .305-in. wide; |
|
124 |
124 |
|
|
|
|
Engine sprocket |
|
21 |
21 |
23 |
23 |
23 |
23 |
Clutch chainwheel |
44 |
44 |
44 |
44 |
44 |
44 |
44 |
Gearbox Std. |
|
21 |
21 |
18 |
18 |
18 |
20 |
Rear wheel |
|
55T |
55T |
46T |
46T |
46T |
46T |
Engine Shock absorber spring length, new |
1.665" |
1.665" |
1.665" |
1.665" |
1.665" |
1.665" |
1.665" |
Engine shock absorber spring, min length |
1.56" |
1.56" |
1.56" |
1.56" |
1.56" |
1.56" |
1.56" |