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Useful Information
TRACING TROUBLES
Engine fails to start, or is difficult to start, may be due t o :
Carburetter flooded unnecessarily.
"Water on high-tension cable.
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 joint.
Lack of fuel because of pipe, or tap, obstruction.
Valve not seating properly.
Contact points dirty,
Incorrect contact point gap.
Ignition not switched on.
Faulty coil or condenser.
Engine misses fire may be due to:
Defective, or oiled, sparking plug.
Incorrect contact point gap.
Contact breaker rocker arm sticking.
Rocker adjustment incorrect.
Oil on contact breaker points.
Weak valve springs.
Defective sparking plug wire.
Partially obstructed petrol supply.
Loss of power may be due t o :
faulty sparking plug.
Lack of oil in tank.
No rocker clearance, or too much clearance.
Weak, or broken, valve spring.
Sticky valve stem.
Valve not seating properly.
Brake adjusted too closely.
Badly fitting, or broken, piston rings.
Punctured carburetter float.
Engine carbonised.
Choked silencer.
Bad air leak between carburetter and head.
Engine overheats may be due t o :
Lack of proper lubrication.
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,
Automatic timing control faulty.
Engine stops suddenly may be due to:
Stuck up valve.
No petrol in tank, or choked petrol supply.
Choked main jet.
Oiled up, or fouled, sparking plug.
Water on sparking plug.
Water in float chamber.
Vent hole in petrol tank filler cap choked.
Loose coil connections.
WWW.PlanDeGraissage.ORG
(Quality or quantity of oil).
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47
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