AJS 350 1954, Maintenance Manual And Instruction Book, Page: 8 / 96

Oversize parts
The following are the only " oversize " variations provided for the 350 and 500 c.c. Single Cylinder machines.
Big-end rollers :
·001 in. oversize
Cylinder re-bore :
·020 in. and ·040 in. oversize
Pistons and rings :
·020 in. and ·040 in. oversize
Pistons (standard size)
Model
350
500
Top of skirt diameter
2·7176 in.
3·2490 in.
Front to rear clearance
·001 in.
·001 in.
Part number
013504
013505
All above measurements are subject to a toleration limit of + or — ·0005 in.
Piston rings
Piston ring gap—Normal
Permissible maximum
Piston ring clearance in groove
·006 in.
·030 in.
·002 in.
Sparking Plug
Model
All
Make
K.L.G.
Type
FE80
Thread
14 mm.
Reach
¾ in.
Point gap
·015 to ·018 in.
Valve timing (with ·014 inch rocker clearance) Standard cams
INLET VALVE EXHAUST VALVE
Opens before T.D.C.
Closes after B.D.C.
350 c.c. 36°
350 c.c. 51°
500 c.c. 18°
500 c.c. 69°
Opens before B.D.C.
Closes after T.D.C.
350 c.c. 50°
350 c.c. 30°
500 c.c. 50°
500 c.c. 30°
Taken with valve ·001" off its seat.
Valve Guide Projection (Top of Guide to Boss)
Inlet— ½"
Exhaust—½"
Valve timing pinion
Retained by nut, threaded
v
in. by 26 threads per in. Left hand thread Part number 000221.
Weight
Weight of machine with empty tanks
Model
350
500
Standard
Rigid frame
344 lbs.
353 lbs.
Spring frame
375 lbs.
386 lbs.
Competition
Rigid frame
300 lbs.
303 lbs.
Wheels (bearing end play)
Bearing and play
·002 in. (just a perceptible rim rock).
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