AJS 350 1954, Maintenance Manual And Instruction Book, Page: 42 / 96

CARBURETTER T UNI N G INFORMATION
Poor idling may be due to :
Pilot jet not operating correctly.
Air leaks. Either at junction of carburetter and inlet port, or by reason of badly
worn inlet valve stem or guide.
Faulty engine valve seatings.
Sparking plug faulty, or its points set too closely.
Ignition advanced too much.
Contact breaker points dirty, pitted, loose, or set too closely.
High-tension wire defective.
Rockers adjusted too closely.
Heavy petrol consumption may be due to :
Late ignition setting.
Bad air leaks. Probably at carburetter joint.
Weakened valve springs,
Leaky float. (Causing flooding.)
Taper needle extension insufficient.
Poor compression, due to worn piston rings or defective valve seatings. (Test
compression with throttle wide open.)
Illustration 14
A
B
C
D
LOW GEAR ON MAINSHAFT
THIRD GEAR ON MAINSHAFT
SECOND GEAR ON MAINSHAFT
MAIN DRIVING GEAR
E
F
G
H
I
LOW GEAR ON LAYSHAFT
THIRD GEAR ON LAYSHAFT
SECOND GEAR ON LAYSHAFT
SMALL PINION ON LAYSHAFT
OIL LEVEL PLUG
Section through gearbox showing gears and clutch with actuating mechanism
40