USEFUL INFORMATION
TRACING TROUBLES
Engine fails to start, or is difficult to start, may be due to :
Water on high-tension pick-up.
Moisture on sparking plug.
Oiled up, or fouled, sparking plug.
Throttle opening too large.
Pilot jet choked.
Air lever in open position, or bad air leak at carburetter flange.
Lack of fuel because of insufficient flooding (cold only).
Lack of fuel because of pipe, or tap. obstruction.
Excessive flooding of carburetter (with hot engine only).
Stuck up engine valve.
Weak, or broken, valve spring.
Valve not seating properly.
Contact points dirty.
Incorrect contact point gap.
Engine misses fire may be due to :
Defective, or oiled, sparking plug.
Incorrect contact point gap.
Contact breaker points loose.
Rocker adjustment incorrect.
Oil on contact breaker points.
Defective sparking plug wire.
Partially obstructed petrol supply.
Loss of power may be due to :
Faulty sparking plug.
Lack of oil in tank.
Weak, or broken, valve spring.
Sticky valve stem.
Valve not seating properly.
Brakes adjusted too closely.
Badly fitting, or broken, piston rings.
Punctured carburetter float.
Engine carbonised.
Choked silencer.
In the following five paragraphs are particulars of failures and troubles that can occur,
together with the probable reasons. These troubles are arranged in the order of their
probability.
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