Specifications

Chapter 2 Fuel system and lubrication
53
2.2 Rubber strap retains rear of petrol tank
4 Petrol tap: removal, repair and replacement
1 Before the petrol tap can be removed, it is first necessary to
drain the tank. This is easily accomplished bv removing the feed
pipe from the carburettor and allowing the contents of the tank
to drain into a clean receptacle, with the tap turned to the
'reserve' position. Alternatively, the tank can be removed and
placed on one side, so that the fuel level is below the tap outlet.
(Take care not to damage the paintwork.)
2 The tap unit is retained by a gland nut to the threaded stub
on the underside of the tank. It can be removed after the fuel
pipe has been pulled off the tap.
3 If the tap lever leaks, it will be necessary to renew it as a
complete unit. It is not possible to dismantle the tap for repair.
5 Carburettor: removal - pre (T)PFC type
1 Before the carburettor is removed from the inlet stub, it is
necessary to detach the petrol pipe, air cleaner hose, and car-
burettor top and throttle valve assembly. It is easier to remove
the petrol tank to lessen the risk of damage to the paintwork,
and to improve access. (Make sure the fuel tap is turned off
first!). Prise off the air hose from the carburettor intake.
2 Unscrew the carburettor top, and withdraw the valve
assembly. If the valve or needle require attention, they can be
detached by compressing the return spring against the
underside of the top, and disengaging the cable end from its
recess in the valve. The needle is held by a spring clip, which is
itself positioned by a second clip inside the valve. It is normally
advisable to leave this assembly undisturbed unless obviously
worn.
3 Slacken and remove the two flange mounting nuts, and pull
the carburettor body clear of the mounting studs. Do not
remove the heat shield or spacing block unless necessary. The
carburettor components can now be dismantled for examina-
tion.
6 Carburettor: overhaul - pre (T)PFC type
1 On early models, prise back the spring clip retaining the
float bowl, tap the bowl gently to break the seal and withdraw
it. On later models remove the three retaining screws and
withdraw the float bowl. Note the seal set in the gasket surface,
which must be renewed if damaged or worn, and check that the
drain plug passage is clean, that the plug seal is in good
condition and that the plug is securely fastened.
2 Displace the float pivot pin to release the float assembly,
then withdraw the float needle. Check the float for leakage and
renew the assembly if damaged or worn; repairs are not
possible. Check the float needle tip for wear. After lengthy
service a ridge or groove will appear; even if this is so small that
it can be seen only with the aid of a magnifying glass, the
needle must be renewed to restore the valve's seal and the
4.2 Petrol tap is secured by a gland nut
4.3 Tap is riveted together, and must be renewed if worn
5.2 Throttle valve may be detached for access to needle