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Identity—Singles
Engine Number
Frame Number
Identity—Twins
Engine Number
Frame Number
Engine Capacities
350 c.c. Single
500 c.c. Single
650 c.c. Twin
Cylinder Sizes
Cylinder bore size
Cylinder bore size
Cylinder bore size
(All measurements subject to a tolerance of + or – ·0005 ins.)
Carburetters—Singles
Main jet
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Main jet (air filter fitted)
Pilot jet
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Throttle valve
Choke size
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Needle position
Needle jet
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Carburetter.
(Standard, De-Luxe and Sports Twins)
Main Jet
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Main jet air filter
Pilot jet
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Throttle valve
Needle position
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Needle jet
Choke size
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Capacities—All
Location
Gear box
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Front fork (each side)
Rear wheel f o r k hinge bearing
Fuel tank
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O i l tank (to top level mark)
Front chain case—Singles
Front chain case—Twins
Compression ratios—Singles
Model
350
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500
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Compression ratios—Twins (Standard and De-Luxe models), CS and CSR model
W i t h standard pistons
W i t h alternative pistons
Race k i t pistons
Ignition coil
Make
Lucas
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Stumped on left-hand side of crankcase
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Stamped on main frame head lug
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Stamped on crankcase left in f ro n t of cylinder
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Stamped on main frame head lug
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Bore 74 m m .
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Bore 82·5 mm.
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Bore 72 mm.
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–350 c.c.
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–500 c.c
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–650 c.c.
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350 c.c.
389/68 size 230
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230
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25
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3½
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1 8 i n .
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Central notch
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·106
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650 c.c.
390
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340
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20
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4
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4
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·106
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1 8 i n .
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British
1 pint
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6½ fl. ozs.
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1½ fl. ozs.
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4 gallons
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4 pints
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12 ozs.
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8 ozs.
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Normal ratio
8·5 t o 1
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7·3 t o 1
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650 c.c.
7·5 to 1
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6·75 to 1
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Type
MA6
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4
4
Stroke 81 m m .
= 3 4 8 c.c.
Stroke 93 mm.
= 4 9 8 c.c.
Stroke 79·35 mm. =646 c.c.
Singles 2·9135 ins.
Singles 3·250 ins.
T w i n 2·8345 ins.
500 c.c.
376/100 size 300
300
376/076 size 25
389/060 size 3½
1·5/32 in.
Central notch
376/072 size ·106
650 c.c. Sports
450
390
20
4
4
·106
1 8 in.
Metric
568·2 c.c.
184·6 c.c.
42·6 c.c.
17·04 litres
2·5 litres
340 c.c.
230 c.c.
Low ratio
According to piston.
See Spares List for
ratios available.
CS and CSR Model
8·5 to 1
7·5 to 1
10·25 to 1
Point gap
·014—·016 in.
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