57 CARBURETTER TUNING INFORMATION
Poor idling may be due to :—
Air leaks. Either at junction of carburetter and engine, or by reason of badly
worn inlet valve stem or guide.
Faulty engine valve seatings.
Sparking plug faulty, or its points set too closely.
Ignition advanced too much.
Contact breaker points dirty, pitted, Ioose, or set too closely.
High-tension wire defective.
Pilot jet not operating correctly.
Tappets adjusted too closely.
Heavy petrol consumption may be due to :—
Late ignition setting.
Bad air leaks. Probably at carburetter and engine 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).
58 TWIST GRIP ADJUSTMENT
A screw is provided in one-half of the twist grip body to regulate the spring tension
on the twist grip rotating sleeve. This screw is locked by a nut and it must be screwed
into the body to increase the tension.
The most desirable state of adjustment is that when the grip is quite free and easy to
turn but, at the same time, will stay in the position in which it is placed.
The complete twist grip can be moved on the handlebar by slackening the two screws
that clamp it in position. The most desirable position is that in which the throttle
cable makes the cleanest and most straight path to the under-side of the petrol tank.
During assembly, all control cable inner wires are coated with a graphite wax lubricant.
This lasts practically indefinitely, but should a new inner wire be fitted this must be
similarly treated during assembly.
38
Summary of Contents for 46/G3L 1946
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