- Details
- Category: Rigid Frame MAC Service Manual
- Hits: 1473
Abridged Specification
|
Engines. |
Model MOV |
Model MAC |
Model MSS |
|||
|
Type |
One Cylinder OHV - 4 stroke |
One Cylinder OHV - 4 stroke |
One Cylinder OHV - 4 stroke |
|||
|
Bore and Stroke |
68 mm. x 68.25 mm. |
68 mm. x 96 mm. |
81 mm. X 96 mm. |
|||
|
Cubic Capacity (Swept Volume) |
248 c.c. |
349 c.c. |
495 c.c. |
|||
|
Rated Horse-Power (A.C.U. Rating) |
2.5 H.P. |
3.5 H.P. |
5 H.P. |
|||
|
Tappet Clearances (For Running) |
Inlet .003-in. Exhaust .006-in. |
Inlet .005-in. Exhaust .010-in. |
||||
|
Tappet Clearances (For Timing) |
Inlet .010-in. Exhaust .015-in. |
|
Inlet .025-in. Exhaust .025-in. |
|||
|
Position of Engine Serial Number |
Stamped (following the serial Letters) on near side of Crankcase below Cylinder. See page 43, Fig. 20. |
|||||
|
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. |
|||||
|
Ratios : With Standard Sprocket |
Top: |
6.35 to 1 |
Top: |
5.5 to 1 |
Top Solo: |
4.9 to 1 |
|
|
Third: |
8.45 to 1 |
Third: |
7.3 to 1 |
Third: |
5.91 to 1 |
|
|
Second: |
11.1 to 1 |
Second: |
9.6 to 1 |
Second: |
7.76 to 1 |
|
|
First: |
16.1 to 1 |
First: |
14 to 1§ |
First: |
11.25 to 1 |
|
Position of Gearbox Serial No. |
Stamped on rear of housing. |
|||||
§ 16.8 on WD /MAC., 18.17 on MAF.
|
Tanks. |
Fuel Capacity |
2.5 gallons 11.35 litres |
2.5 gallons 11.35 litres |
3.5 gallons 15.9 litres |
|
|
Oil Capacity |
½ gall. 2.27 litres |
½ gall. 2.27 litres |
½ gall. 2.27 litres |
| Sprockets | |||
|
Primary Drive - driver |
19 teeth |
22 teeth |
23 teeth |
|
Primary Drive - driven |
44 |
44 |
44 |
|
Final Drive - driver |
19 |
19 |
Solo 18T. S/C 16T. |
|
Final Drive - driven |
52 |
52 |
46 teeth |
|
Chains |
|||
| Primary Pitch & Width | .5-in. x .305-in. | .5-in. x .305-in. | .5-in. x .305-in. |
|
- Roller Diameter |
.335-in. |
.335-in. |
.335-in. |
|
- No. of Pitches |
74 |
75 |
68 |
|
Rear - Pitch & Width |
.5-in. x .305-in. |
.5-in. x .305-in. |
.625-in. X .380-in. |
|
- Roller Diameter |
.335-in. |
.335-in. |
.4-in. |
|
- No. of Pitches . . |
108 |
108 |
99 |
|
Height to Top of Saddle |
27.5-in. |
27.5-in. |
28-in. |
|
Wheel Base |
52.25-in. |
52.25-in. |
55-in. |
|
Width over Handlebars |
27.5-in. |
27.5-in. |
29-in. |
|
Wheels: Rims |
WM2 x 19 |
WM2 x 19 |
WM3 x 19 |
|
Tyres: Front |
26-in. X 3.25-in. |
26-in. X 3.25-in. |
26-in. X 3.5-in. |
|
Rear |
26-in. X 3.25-in. |
26-in. X 3.25-in. |
27-in. X 4-in. |