DATA
Engine Number Stamped on left hand side of crankcase
frame Number
Stamped on seat lug of main frame, on right hand side (below the saddle
Bore
350 c.c. Models—2·7187 in. (2F in.)
500 c.c. Models—3250 in. (3¼in.)
Stroke
All Models—93 mm. (3·5625in.)
Engine capacity, in cubic centimetes 350 Models—55/16M, 55/16MS, 55/16MC and 55/16MCS—347
500 Models—55/18, 55/18S, 55/18C and 55/18CS—498
Capacities
Location British Metric
Engine 350 c.c.
Engine 500 c.c.
Gear box
Front fork (each side)
Rear leg (each leg)*
Rear wheel fork hinge bearing*
Fuel Tank (all except Competition)
Fuel tank (Competition)
Oil tank (to top level mark)
*On Spring Frame Models only.
21·170 cub. in.
30-380 cub. in.
1 pint
6½
fl.
ozs.
3 fl. ozs.
1½
fl.
ozs.
3¾ gallons
2¼ gallons
4½ pints
347 c.c.
498 c.c.
568·2 c.c.
184·6 c.c.
85 c.c.
42·6 c.c.
17·04 litres
10·2285 litres
2·557 litres
Carburetter (Touring and Rigid Frame Competition Models only)
Type
Main jet
Pilot jet
Throttle valve
Choke size
Needle position
Needle jet
350
c.c.
Monobloc 376/5
376/100 size 210
376/076 size 30
376/060 size 3
1·1/16"
Central notch
376/072 size ·1065
500 c.c.
Monobloc 389/1
376/100 size 260
376/076 size 30
389/060 size 3
1·5/32"
Central notch
376/072 size ·1065
NOTE—
Early 1955 Models 500 c.c. up to Engine No. 27,000 are fitted with type Monobloc 376/14 carburetters
with main jet size 240, throttle valve 376/060 size 3 and needle position 2nd notch from top.
All Spring Frame Competition Models are fitted with T.T. type carburetters.
Compression ratios
Model
350
500
Normal
ratio
6·53 to 1
6·26 to 1
High
ratio
According to piston.
See Spares List for
ratios available.
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