Carburetter Adjustment; Twist Grip Adjustment; Air Filter - Matchless G3L Maintenance Manual

CARBURETTER ADJUSTMENT

With the taper needle projection, main jet size, and type of throttle slide specified
(see page 4) correct carburation except at idling speed is assured.
In the event of difficulty being experienced look for cause under heading Useful Inform-
ation, pages 72 and 73.
To check for correct idling mixture, first run the engine until it is just warm but not hot
when with the throttle nearly closed and air fully open it should fire evenly and slowly.
If it fails to do so, first of all make certain that the sparking plug is clean and the point
setting correct. Having done this and idling is still uneven try resetting the pilot jet
air screw.
Adjustment of this air screw is not unduly sensitive and it should be possible to obtain
the correct setting for even firing in a few seconds.
In the event of even firing at idling speed being unobtainable by adjustment of the air
screw look for obstruction in the pilot jet.
Having obtained even firing all that remains is to adjust if necessary the position of the
throttle stop screw, until the desired idling speed is obtained.

TWIST GRIP ADJUSTMENT

A screw is provided in one of the halves of the twist grip body to regulate the spring
tension on the grip rotating sleeve. This screw, which Is locked by a nut, 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
operate but, at the same time, will stay in any position in which it is placed.
The complete twist grip can be moved on the handlebar by slackening the two screws
that clamp together the two halves of the body.
which the throttle cable makes the cleanest and most straight path to the under-side
of the petrol tank.
Smooth throttle operation is assured by the provision of a cable oil nipple. At the first
signs of jerky action a little engine oil should be injected, applying the gun as near
vertical as possible (nozzle downward).

AIR FILTER

In locations, such as the United Kingdom, where the roads and atmosphere are
particularly free from dust, it is not considered necessary to have an air filter fitted to
the carburetter, but in countries where the atmosphere contains a very heavy dust
content, an air filter is essential in order to prevent abrasive wear.
The filter available (optional extra) for the conditions mentioned above is of the " Oil
Wetted " type, and this requires periodical servicing.
When servicing the air filter, withdraw the filter element.
petrol, paraffin or other suitable solvent and allow to dry. Then re-oil, using one of the
light oils (SAE-20), enumerated in the final table on page 14, and allow to drain before
replacing in the filter case.
element every 10,000 miles.
G—S.
The most desirable position is that in
Clean regularly at intervals of 1,000 miles, and renew the
39
Thoroughly wash this in