A.J.S. 16MS, Instruction Book

Page: 81 / 94

Engine overheats may be due to :
Lack of proper lubrication. (Quality or quantity of oil.)
Faulty sparking plug.
Air control to carburetter out of order.
Punctured carburetter float.
Engine carbonised.
Weak valve springs.
Pitted valve seats.
Worn piston rings.
Ignition setting incorrect.
Choked silencer.
Engine stops suddenly may be due to :
No petrol in tank, or choked petrol supply.
High-tension wire detached from sparking plug.
Choked main jet.
Oiled up, or fouled, sparking plug.
Water on high-tension pick-up, or sparking plug.
Water in float chamber.
Vent hole in petrol tank filler cap choked.
Stuck up valve.
EXCESSIVE OIL CONSUMPTION
Excessive oil consumption may be due to :
Stoppage, or partial stoppage, in the pipe returning oil from the engine to the oil tank.
Badly worn, or stuck up, piston rings. (Causing high pressure in the crankcase.)
Air leak in dry sump oiling system.
Worn inlet valve stem or guide.
Improper non-return valve action.
EXCESSIVE PETROL CONSUMPTION
Excessive petrol consumption may be due to :
Leaks in the petrol feed system. (Damaged fibre washers, loose union nuts on piping,
defective float needle action.)
Incorrect ignition setting. (Ignition not advanced sufficiently.)
Defective engine valve action.
Incorrect use of air control lever.
Moving parts of carburetter badly worn. (Only possible after very considerable mileage.)
Bad air leak at carburetter junction.
STEERING UNSATISFACTORY
Incorrect steering head adjustment. (too tight or excessively slack.)
Pitted steering head ball races resulting from loose adjustment.
Wheels out of alignment.
Front and/or rear tyre tread not correctly manipulated to run true with wheel (causes
handlebar oscillation at low road speed.)
Damaged front fork main tubes resulting from impact.
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