BSA Winged Wheel W1 Instruction Manual page 34

nearer the end giving a. weaker mixture, and a
notch in the other direction (:15. nearer the tapered
shank) giving a. richer mixture. '
The float H maintains the correct level 01 petrol
in the float chamber ], whoge cover K, held. by
two screws, incorporates a gauze filter L.
Attached to the top of the mixing chamber is
stub 1V1, also held by two screws, and this carries
the combined flame trap and air filter N.
Petrol Filter.
The gauze petrol filter L should be inspected and
cleaned if necessary at regular intervals. and this
can conveniently be done every time the engine is
decarbonised as described on pages 23 to 29.
Air Filter.
This is built into the carburetter intake bell and.
as it is of the oil dip type. it requires to be dis-
mnntled and cleaned periodically,say, everythousand
milw To do this, release the clip bolt, and take
the bell ofi. Soak it thnrnughly in petrol, allow it
to dry. and then submerge it in. light engine oil for
a few minutes. Take out and allow the surplus oil
to drain nfi.
Float Chamber.
After very considerable mileages a sifiall amount
of foreign matter may accumulate in the bottom
of the float chamber ], and ii the cycle is used
during all weathers there may also be one or two
heads of water. The float chamber can easily be
cleaned out with a. piece of dry rag, and when the
float is subsequently replaced make sure it is the
right way round, with the taper point of the needle
upwards.
33