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4.1 2 Fuel and exhaust systems
13.5 Reeds (A), valve body (6) and stc
3 Undo the bolts securing the carburettor
inlet manifold to the crankcase and remove
the manifold, the manifold gasket, the reed
valve and the reed valve gasket. Note which
way round the reed valve is fitted. Discard the
gaskets as new ones must be fitted on
reassembly.
Inspection
4 Check the reed valve body closely for cracks,
distortion and any other damage, particularly
around the mating surfaces between the
crankcase and the intake manifold
-
a good
seal must be maintained between the
components, otherwise crankcase pressure will
be lost and engine performance will be affected.
13.8b Tab on gaskets and valve body
should face t o the rear
14.2
Detach the carburettor heater union
bpper plate (C)
13.8a Fit ns
5 Check the reeds themselves for cracks and
any other damage. Ensure there are no dirt
particles trapped between the reeds and the
valve body. The reeds should sit flat against
the valve body so that a good seal is obtained
when the crankcase is under pressure (see
illustration). After prolonged use, the reeds
tend to become bent and will not seal
properly, in which case a new reed valve
should be fitted. A good way to check is to
hold the valve up to the light
-
if light is visible
between the reeds and the body they are not
sealing properly. If the engine is difficult to
start or idles erratically, this could be the
problem.
6 Check that the stopper plate retaining
screws are tight; do not disassemble the valve
unnecessarily as individual components are
not available.
Installation
7 Ensure that the mating surfaces between
the crankcase, the reed valve and the inlet
manifold are clean and perfectly smooth.
8 Install a new gasket on the crankcase (see
illustration). The reed valve will only fit one
way round so ensure the gasket is fitted
correctly, then install the valve (see
illustration).
9 Install the. new manifold gasket and the
manifold, then install the inlet manifold-to-
14.3 Detach the heater hoses from the
cylinder head
tw
valve body and manifold gaskets
crankcase bolts and tighten them to the
torque setting specified at the beginning of
this Chapter.
10 Securely reconnect the fuel tap vacuum
hose, then refit the carburettor (see Section 9).
14 Carburettor heater
-
removal and installation
(liquid-cooled engines)
Removal
1 Remove the storage compartment (see
Chapter 7).
2 Undo the screw securing the carburettor
heater union to the carburettor
(see
illustration).
3 Release the clips securing the carburettor
heater hoses to the unions on the cylinder
head and detach the hoses (see illustration).
4 Withdraw the heater assembly from the
machine and drain out any residual coolant.
5 Check the condition of the heater hose
clips and discard them if they are damaged
and fit new clips on reassembly.
Installation
6 Installation is the reverse of removal.
Ensure the hose clips secure the hoses firmly
on the cylinder head unions (see illustration).
L
-
14.6 Hoses must be clipped securely t o
the unions
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