| Frame numbering |
1954. Prefix K7C-xxx.
1955. 55K7C-xxx. 1956. 56K7C-xxx. 1957.
57K7C-xxx
1958. AK7C-xxx. |
| |
|
| Engine |
Villiers 7E. Capacity 197cc.
59mm x 72mm |
| Gears |
Three speed or four speed optional. |
| Frame |
Single downtube with swinging arm rear.
Frame tube had liners for extra strength and a bracing tube at the head
stock. |
| Forks |
Telescopic fork with oil-damped two-rate
springs. The fork "H section was strengthened also (but not much
!) |
| Fork oil capacity |
165cc per leg. SAE 50 |
| Tyres |
Front: 21" x 2.75"
Rear: 3.50" x 19" |
| Wheel rims |
Front: Dunlop WM1 36 hole.
Rear: Dunlop WM2 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 |
1954 Villiers S.24.
1955 Villiers S.25. 1⅛" bore. |
| Main jet |
No.120 Standard. |
| Throttle |
No. 3 |
| Needle |
No. 3½. |
| Needle setting |
1.95" from tip of needle
to bottom of slide |
| 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 |
Not applicable as the primary chain runs
within the gearbox. |
| Chains |
Primary chain: 66 pitches. ⅜"
x ¼" x 0.225"
Final drive chain:
1954 / 55: 123 pitches. ½" x 0.335" x 0.205" wide.
1956 125 pitches. |
| Sprockets |
Engine: (crankshaft) ⅜" pitch.
23 teeth.
Gearbox (final drive) 17 teeth ½" pitch
Rear wheel sprocket: 48 teeth |
| Brakes |
5" front & rear |
| Bulbs |
A direct lighting set was available for
the Cotswold.
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. |
