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This is a common fault on the 1200cc to 1600cc engines. Here are a few simple
things to check.
1) When the engine is cold, check that the automatic choke is working. This
is found on the right hand side of the carb and actuates a stepped mechanism
on the left hand side. Turn on the ignition, push the accelerator pedal down
once, then check that the 'hammer' is on the largest step. If it is start the
engine and allow it to warm up, as the engine warms up the åhammer¼ should
work its way down the steps until the engine is warm and the choke is no longer
engaged. If this is not the case, setting up of the choke is explained in detail
in both the Haynes manual and the John Muir 'Idiots guide'.
2) The twin port engines have two rubber boots that join the central part of
the inlet manifold to the two cast manifolds that meet the cylinder heads. These
boots crack and split allowing air to be sucked in and therefore making the engine
run too lean, hence the stalling. Replacing the manifold boots is the only solution.
3) On the side of the carb is an idle cut off valve. It is a round barrel shaped
solenoid that is electrically powered from the coil. With the ignition on but
the engine not running, remove the wire from the solenoid, you should hear a
clicking noise as the plunger opens and closes. If there is no click, check the
wiring, sometimes they become dirty on the internal shaft and can be removed
and cleaned, otherwise if it still does not work you can easily replace it with
a new unit.
4) Idle is incorrectly set. The idle speed can be adjusted by turning the idle
mixture screw (often referred to as the Volume Control Screw). This is the small
screw that is on the left hand side of the carb just above the bottom spindle.
It is also worth removing the screw to make sure it is not blocked (count the
number of turns out and then you will know how many turns to screw it back in).
5) The bottom spindle (where the accelerator cable mounts) can wear out, allowing
air to seep in and change the idle mixture. With the engine off, take hold of
the bottom spindle and see if there is movement up and down and side to side.
When the wear is bad it can leak fuel out so you may see that this area is washed
clean by the leaking petrol. If there is play you will need to either have the
bushes replaced or fit a new carb. See special offers pages!
Please note: It is recommended that you have the CO2 set up by a reputable
garage that has a 4 gas analyser. It is almost impossible to correctly set the
CO2 at home. The CO2 is the measurement of the quantity of fuel that is burnt
when the engine is running.
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