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. 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.
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. Thoroughly wash this in
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. Clean regularly at intervals of 1,000 miles, and renew the
element every 10,000 miles.
TO REMOVE THE AIR FILTER ELEMENT
Pull the rubber hose off the carburetter air intake.
Remove the frame cover and pull off the hose end from the air filter.
Remove the bolts securing the filter to the oil tank and withdraw the entire filter unit.
The filter element is held in its cage by bolts and nuts and lock washers. After cleaning,
replace the filter. When the hose is replaced on the filter make sure that it is properly
located. The end of the hose is split along the edge of the lip, and the neck of the filter
unit slips into this groove.
CARBURETTER TUNING INFORMATION
Poor idling may be due to :
Pilot jet not operating correctly (partially choked) or incorrect air supply.
Air leaks. Either at junction of carburetter and inlet port, 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.
Automatic ignition unit faulty.
Contact breaker points dirty, pitted, loose, or set too closely.
High-tension wire defective.
Rockers adjusted too closely.
Heavy petrol consumption may be due to :
Late ignition setting.
Automatic ignition unit faulty.
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.)
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