| Frame numbering |
1957. 57L25-xxx. 1958.
AL25-xxx. 1959. BL25-xxx etc |
| |
|
| Engine |
AMC 25T. 249cc. 66mm x 73mm |
| Gears |
Four speed |
| Frame |
Single downtube with fabricated centre
section and swinging-arm rear. |
| Forks |
Telescopic. |
| Tyres |
18" x 3.25" front & rear. |
| Tyre pressures |
Solo: Front 16 lbs.psi. Rear
19 lbs. psi.
Pillion: Front 16 lbs psi. Rear 25 lbs psi. |
| Wheel rims |
Dunlop WM2 36 hole |
| Ignition timing |
¼" before top dead centre. |
| Points gap |
0.012" - 0.015" |
| Plug gap |
0.018" - 0.022" |
| Plug type |
Original spec. Lodge CCL 14 |
| Carburettor |
AMAL Type 389 / 27. Bore 1⅛" |
| Jet size |
420 |
| Needle jet |
0.105" |
| Needle setting |
2nd groove from top |
| Tank capacity |
2¾ 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 plug level |
| Chains |
Primary chain: 60 pitches. ⅜" x ¼"
x 0.225"
Final drive chain: 127 pitches. ½" x 0.335" x 0.305" wide. |
| Sprockets |
Engine: (crankshaft) 20 teeth ⅜" pitch.
Gearbox (final drive) 19 teeth ½" pitch
Rear wheel sprocket 52 teeth |
| Brakes |
6" front & rear |
| Bulbs |
Main bulb: 6v - 30 /24w
Tail lamp: 6v - 3w
Stop lamp: 6v - 6v - 18w
Parking lamp bulb: 6v - 3w
Speedo: 6v - 5.3amp. |
