| Frame numbering |
1956. 56K7T-xxx. 1957.
57K7T-xxx. 1958. AK7T-xxx |
| |
|
| Engine |
Villiers Mk 7E/4. Capacity 197cc.
59mm x 72mm |
| Gears |
Four speed. |
| Frame |
Single downtube with swinging-arm rear. |
| Forks |
Telescopic. Two way oil damping.
The lower crown of the fork assembly has triangular bracing pieces. |
| Fork oil capacity |
165cc per leg. SAE 50 |
| Tyres |
Dunlop Trials Universal. 21" x
2.75" front. 4.00" x 19" rear. |
| Wheel rims |
Front: Dunlop WM1 36 hole.
Rear: Dunlop WM3 36 hole. |
| Ignition timing |
11/64" before top dead centre. |
| Points gap |
0.012" - 0.015" |
| Plug gap |
0.018" - 0.025" |
| Plug type |
Original spec. Lodge HH14. 14mm
short reach. |
| Carburettor |
1956 Villiers S.25. 1⅛" bore.
1957 - 58. AMAL Type 376 / 76. (Mixing chamber - 15/16"
bore) |
| Jet size |
1956: Villiers No.120 (standard)
1957 - 58: AMAL 180 (standard) |
| Throttle |
1956:
Villiers No 3
1957 - 58: AMAL No 3½ (standard) |
| Needle |
1956: Villiers No. 3½ (standard)
AMAL ? |
| Needle setting |
1.95" out. |
| Tank capacity |
2¼ gallons approximately. Use of unleaded
fuel will cause no problems |
| Petroil mixture |
20:1 as originally specified. Can be
safely reduced to 24:1 with modern oils. |
| Gearbox capacity |
Remove oil level screw on side of engine
casing and oil filler screw on top of casing. Fill oil through the
filler opening until oil begins to run out through the level plug hole.
The correct level of oil is then assured. Check it regularly. Castrol
"D" SAE 140 |
| Chaincase capacity |
Fill to level plug. |
| Chains |
Primary chain: 66 pitches. ⅜"
x ¼" x 0.225"
Final drive chain: 126 links. ½" x 0.335" x 0.205" wide |
| Sprockets |
Engine: (crankshaft) 23 teeth. ⅜" pitch.
Gearbox (final drive) 17 teeth ½" pitch
Rear wheel sprocket: 50 teeth (standard) |
| Brakes |
5" front & rear |
| Bulbs |
A direct lighting set was available for
the Commando.
Headlamp: 6v - 30 / 30w B.C.
Tail: 6v - 3w B.C.
Pilot lamp: 3.5v - 0.15amp. M.E.S.
Speedo: 6v - 0.15amp. M.B.C. |
