| Frame numbering |
51 prefix M
& suffix F. 52 - 53 prefix J. |
| |
|
| Engine |
Villiers 1F. Capacity 98cc.
47mm x 57mm. |
| Gears |
Two speed with clutch. Handlebar gear
lever has "trigger". |
| Frame |
Single downtube with rigid rear. |
| Forks |
Taper tube girder type. Single, central
undamped spring. |
| Tyres |
2.25"x 21" Standard. |
| Tyre pressures |
Front 20 lbs.psi. Rear 28lb. psi |
| Wheel rims |
Dunlop WMO 36 hole. Silver painted
(Argenized) |
| Ignition timing |
⅛" before top dead centre. |
| Points gap |
0.012" - 0.015" |
| Plug gap |
0.020" |
| Plug type |
Original spec. Lodge H 14. Champion
J10 Com (USA) |
| Carburettor |
Villiers Type 6/0 |
| Jet size |
8 |
| Needle |
No. 2½ |
| Needle setting |
29 / 32" from tip of needle
to bottom of slide |
| Tank capacity |
1½ gallons approximately. Use of unleaded
fuel will cause no problems |
| Petroil mixture |
16:1 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 |
| Chains |
Primary chain: 56 pitches. ⅜"
pitch x 0.155" wide x ¼" roller
Final drive chain: ½" x 0.305" x 0.192" wide (Coventry 112045).
Tension movement max. ⅜" vertical |
| Sprockets |
Engine: (crankshaft) 17 teeth x ⅜" pitch.
Gearbox (final drive) 14 teeth ½" pitch |
| Brakes |
4" front & rear |
| Spokes |
Galvanised. 12g. (10g optional)
90° head |
| Bulbs: Direct |
Main headlamp bulb: 6v - 30 / 30w.
Tail lamp: 6v - 3 w
Parking lamp bulb: 3½v - 0.15amp
Parking lamp battery Ever Ready No. 1289 |
