CHECK SPARKS

SPARK PLUGS If the fuel system is okay, the next suspect is the ignition system. Take out the spark plugs. Let them dry if they’re wet with fuel. Clean them with a brass wire brush and set the gaps (usually 0.6mm)

SPARK AT PLUGS? Replace the HT lead. Attach one of the spark plug leads to a spare plug and rest it on the cylinderhead. Crank again. If there’s no spark, the rotor arm or its contact in the cap are defective.

DISTRIBUTOR Turn the engine so the points are closed. Flick them open repeatedly with the ignition on. If they don’t spark, hold them open and check they’re getting power. If they are, try another condenser.

LOW TENSION PROBLEMS The most common problem is oxidation of the contact surfaces of the points, which prevents current flowing through the coil. Flicking the points or a rub with fine wet-and-dry paper should fix this.

SPARK AT COIL? Replace the distributor cap and remove the central HT lead. Hold it in insulated pliers about 5mm from the cylinderhead and crank the engine. A strong spark suggests the points and coil are fine.

HIGH TENSION PROBLEMS The usual obstacle to sparking at the plugs is dirt on the coil, HT leads and distributor cap. Clean inside-and-out with petroldampened rags. Replace any protective rubber caps that have split.