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Engines. |
Model MOV |
Model MAC |
Model MSS |
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Type |
One Cylinder OHV - 4 stroke |
One Cylinder OHV - 4 stroke |
One Cylinder OHV - 4 stroke |
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Bore and Stroke |
68 mm. x 68.25 mm. |
68 mm. x 96 mm. |
81 mm. X 96 mm. |
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Cubic Capacity (Swept Volume) |
248 c.c. |
349 c.c. |
495 c.c. |
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Rated Horse-Power (A.C.U. Rating) |
2.5 H.P. |
3.5 H.P. |
5 H.P. |
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Tappet Clearances (For Running) |
Inlet .003-in. Exhaust .006-in. |
Inlet .005-in. Exhaust .010-in. |
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Tappet Clearances (For Timing) |
Inlet .010-in. Exhaust .015-in. |
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Inlet .025-in. Exhaust .025-in. |
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Position of Engine Serial Number |
Stamped (following the serial Letters) on near side of Crankcase below Cylinder. See page 43, Fig. 20. |
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Gearboxes |
4 speeds. Operated by Right-hand Pedal on all three Models. Downward movement of Pedal engages higher gear. Pre-war Models and some war-time machines operate the opposite way. |
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Ratios : With Standard Sprocket |
Top: |
6.35 to 1 |
Top: |
5.5 to 1 |
Top Solo: |
4.9 to 1 |
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Third: |
8.45 to 1 |
Third: |
7.3 to 1 |
Third: |
5.91 to 1 |
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Second: |
11.1 to 1 |
Second: |
9.6 to 1 |
Second: |
7.76 to 1 |
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First: |
16.1 to 1 |
First: |
14 to 1§ |
First: |
11.25 to 1 |
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Position of Gearbox Serial No. |
Stamped on rear of housing. |
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§ 16.8 on WD /MAC., 18.17 on MAF.
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Tanks. |
Fuel Capacity |
2.5 gallons 11.35 litres |
2.5 gallons 11.35 litres |
3.5 gallons 15.9 litres |
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Oil Capacity |
½ gall. 2.27 litres |
½ gall. 2.27 litres |
½ gall. 2.27 litres |
| Sprockets | |||
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Primary Drive - driver |
19 teeth |
22 teeth |
23 teeth |
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Primary Drive - driven |
44 |
44 |
44 |
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Final Drive - driver |
19 |
19 |
Solo 18T. S/C 16T. |
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Final Drive - driven |
52 |
52 |
46 teeth |
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Chains |
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| Primary Pitch & Width | .5-in. x .305-in. | .5-in. x .305-in. | .5-in. x .305-in. |
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- Roller Diameter |
.335-in. |
.335-in. |
.335-in. |
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- No. of Pitches |
74 |
75 |
68 |
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Rear - Pitch & Width |
.5-in. x .305-in. |
.5-in. x .305-in. |
.625-in. X .380-in. |
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- Roller Diameter |
.335-in. |
.335-in. |
.4-in. |
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- No. of Pitches . . |
108 |
108 |
99 |
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Height to Top of Saddle |
27.5-in. |
27.5-in. |
28-in. |
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Wheel Base |
52.25-in. |
52.25-in. |
55-in. |
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Width over Handlebars |
27.5-in. |
27.5-in. |
29-in. |
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Wheels: Rims |
WM2 x 19 |
WM2 x 19 |
WM3 x 19 |
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Tyres: Front |
26-in. X 3.25-in. |
26-in. X 3.25-in. |
26-in. X 3.5-in. |
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Rear |
26-in. X 3.25-in. |
26-in. X 3.25-in. |
27-in. X 4-in. |