| Engine MOV. | Bore 68m /m. | Engine MAC. | Bore 68m /m. |
| Stroke 68.25m /m. | Stroke 96m /m. | ||
| Capacity 248c.c. | Capacity 349c.c. |
Compression ratios : MOV and MAC, 6¾ to 1.
It is necessary to use as fuel one of the Ethyl Petrols or Cleveland Discol.
Gearbox. Gear Ratios MOV. With 19T. sprocket
| Top | 6.35:1 |
| Third | 8.45:1 |
| Second | 11.1:1 |
| First | 16.1:1 |
Gear Ratios MAC.
| Top | 5.5:1 |
| Third | 7.3:1 |
| Second | 9.6:1 |
| First | 14 to 1 |
Note. Up to Engine No. MAC. 973, a 19T Engine Sprocket and 22T Gearbox Sprocket were standard. Ratios were approximately the same. A nineteen tooth sprocket is now fitted as standard.
Chains.
Pitch ½".
Width .305".
Ground Clearance : 5"
Height to top of saddle : 27½"
Wheel base : 52¼"
Weight complete MOV 275 lbs. approx. MAC 280 lbs. Approx.
Width over handlebars (overall width) : 27½"