| Frame numbering |
1949 / 50 / 51. Prefix MDO or DO |
| |
|
| Engine |
Villiers Mk 6E. Capacity 197cc. |
| Gears |
Three speed |
| Frame |
Single downtube with rigid rear. |
| Forks |
1949 - Dunlop telescopic forks with
rubber in compression
1950 / 51 - Model 5 forks with spindle offset in front of the fork leg. |
| Tyres |
Front. 2.75" x 19". Rear.
3.25" x 19" |
| Wheel rims |
Dunlop WM1 36 hole |
| Ignition timing |
5/32" before top dead centre. |
| Points gap |
0.015" |
| Plug gap |
0.018" - 0.025" |
| Plug type |
Original spec. Lodge HH14 |
| Carburettor |
Villiers Type 4/5 two lever |
| Jet size |
|
| Needle |
No.4½ |
| Needle setting |
Variable |
| Tank capacity |
2¼ gallons. 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 gearbox
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 drain plug level. |
| Chains |
Primary chain: 50 pitches (Renold
110044)
Final drive chain: ½" x 111 pitches. |
| Sprockets |
Engine: (crankshaft) 19 teeth x ⅜" pitch.
Gearbox (final drive) 15 teeth x ½" pitch
Rear wheel sprocket 52 teeth |
| Brakes |
5" front & rear |
