TECHNICAL DATA
Engine Number—
on top of crankcase below cylinder.
Frame Number—
ENGINE:
Model D1
Model D3
Model D5
Capacity ... ... ... ...
Cylinder
bore ... ... ...
Stroke
... ... ... ...
Compression ratio
...
...
Piston ring gap (minimum) ...
(maximum)
Sparking
plug
... ... ...
Plug points gap (minimum) ...
(maximum)
123 c.c
52 mm.
58 mm.
6.5 : 1
.009 in.
.013 in.
L10S (L7)
.018 in.
.020 in.
148 c.c
57 mm.
58 mm.
6.4 : 1
.009 in.
.013 in.
L10S (L7)
.018 in.
.020 in.
174 c.c
61.5 mm.
58 mm.
7.4 : 1
.009 in.
.013 in.
L10S (L7)
.018 in.
.020 in.
TRANSMISSION:
Gear ratios—top
...
...
second ... ...
first
... ...
Clutch—friction plates
...
Chain size and pitch:
(front)
⅜
× .250 in.
...
(rear) ½ × .335 in. ...
...
Teeth on—engine sprocket ...
gearbox sprocket ...
clutch sprocket ...
rear chainwheel ...
7.0
11.7
22.0
3
50
117
17
15
38
47
7.0
11.7
22.0
3
50
121
17
15
38
47
6.48
10.74
20.2
3
50
121
17
16
38
46
CAPACITIES:
Fuel
tank ... ... ... ...
Petroil
mixture ... ... ...
Gearbox ... ... ... ...
1¾ gall.
See page 18
¾ pint
1¾ gall.
See page 18
¾ pint
2 gall.
See page 18
¾ pint
WHEELS:
Rim size (front)
...
...
(rear)
... ... ...
Tyre size (front)
...
...
(rear)
... ... ...
Tyre pressure
(front)
...
(rear) ...
...
Brake size—diameter ...
...
wide
... ...
WM1–19
WM1–19
2.275–19
2.75–19
16 p.s.i.
22 p.s.i.
5 in.
⅝
in.
WM1–19
WM1–19
2.75–19
2.75–19
16 p.s.i.
25 p.s.i.
5 in.
⅝
in.
WM1–18
WM1–18
3.00–18
3.00–18
16 p.s.i.
24 p.s.i.
5 in.
⅞
in.
5
