A.J.S. 8, 14, Instruction Book, Page: 26 / 60

AIR FILTER
In locations, such as the United Kingdom, where the roads and atmosphere are particu-
larly 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 10, and allow to drain before
replacing in the filter case. Clean at intervals of 2,500 to 5,000 miles according to road
conditions, and renew the element every 10,000 miles.
TO REMOVE THE AIR FILTER ELEMENT
Remove the accessory compartment cover, by unscrewing the top central screw, then
take out the bolts under the cover.
Slide the rubber connection along the carburetter intake, remove the nut for the filter
clamp, take out the filter.
To dismantle the filter remove the central bolt.
CARBURETTER T U N I N G INFORMATION
Poor idling may be due to:
Air leaks. At function of carburetter and cylinder head, 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. Partially choked or incorrect air supply.
Rockers adjusted too closely.
Heavy petrol consumption may be due to:
Late ignition setting.
Bad air leaks. Probably at carburetter joints.
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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