Instruction manual

CARBURETTER TUNING INFORMATION

Poor idling may be due to :

Air leaks. Either at junction of carburetter and inlet port, or by reason of badly worn

inlet valve stems or guides.

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.

Pilot jet not operating correctly.

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 16

The Transmission of power, or drive, through the gears may easily be

traced on above illustration.

F—A