A.J.S. 16 - Twin Cylinder Ignition and Components; Single Cylinder Engine Details; Oversize Parts

Ignition ( Magneto)—Twins
Make
Lucas
Type
K2F
Rotation
Ant i-clock
Point gap
·012 in.
Model
Std.
CSR model
Make
K.L.G.
K.L.G.
Type
FE80
FE220
Thr ead
14
mm.
14 mm.
Reach
¾in.
¾in.
Point gap
·020 to ·022 in.
·020 to ·022 in.
Crankpin
H—1·62575 in.
L—1·62525 in.
Centre bearing
H—1·62675 in.
L—1·62625 in.
Sparking Plug
Connecting rod—Twins
Internal diameter small end oegduG n pin diameter
¾ in. + ·0005 in (H)
¾
in. – ·0001 to – ·0003 in.
¾ in. – ·0000 in. (L)
NOTE—The 650 c.c. c on rods use chamfered end caps. Early type rods will not interchange.
Crankshaft diameters
Pistons (standard size). T op sk irt diameter (Twins)
500 c.c.
H—2·5933 in.
L—2·5925 in.
650 c.c.
H—2·8295 in.
L—2·8287 in.
Pistons (standard size). Top skirt diameter (Singles)
350 c.c.
2·7176 in.
+ or – ·0005 in.
500 c.c.
3·2437 in.
+ or – ·0005 in.
Piston rings
Normal gap ·006 in. maximum permissible ·030 in.
Engine shaft location—Singles
If the flywheel driving side shaft is removed it must be correctly located otherwise the efficiency of the
alternat or will be impaire d.
On the face of the driving side flywheel is a mark in the form of a "dot". Th e key for the rotor must
line up with this marking, for correct location.
Valve guide projection (top of guide to boss)—Singles
Inlet—½ in. Exhause—½ in.
Valve timing pinion-—Singles
Retained by nut, threaded v in. by 26 threa ds per in. Left hand thread. Part number 000221.
Valve springs—Singles
Free length (between centre of wire)— 2 in.
Renew when x to ¼ in. less than normal free length.
Valve springs—Twins
Outer valve spring gnirpsevlavrInne
Free length Part number Free length Part numb er
2 33/64 in. 018348 2 Q in. 018347
Renew valve springs when 3/16 to 1/4 in. less than normal free length.
Valve timing
All timing gears are marked for ease of setting. See page 34 and 42.
Oversize parts—Singles
The following are the only "oversize" variations provided for the 350 and 500 c.c. Single Cylinder m achines
Big-end rollers: Cylinder re -bore: Pistons and rings:
·001 in. oversize ·020 in. and ·040 in. oversize ·020 in. and ·040 in. oversize
Oversize or undersize parts—Twins
The following are the only "oversize" variations provided for the Vertical Twin machines.
Big-end and crankshaft centr e main bearings:
Undersize
Cylinder re-bore:
·020 in. and ·040 in. oversize
·010 below normal. (Journals to be re-ground to suit)
·020
·030
Pistons a nd rings:
·020 in. and ·040 in. oversize
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