Cleaning The Carburettor - MINSK Repair Manual

the petrol mix which might do the trick. If it doesn't work then return it to its
original position.
Prolonged rain or a high stream crossings will dampen the paper in the air-filter
and limit the amount of air passing through to the carburettor. This will cause a
petrol-rich mixture to get to the sparkplug which will flood it and cause it to die
when the accelerator is opened too much. So check your air filter and if it is too
wet then either dry it in the sun, buy a new one or use a clean T-shirt as an
impromptu filter.
Confirm that the accelerator cable is not stiff and that the accelerator handle
can rotate back to its rest position. It is possible that the gate inside the carburettor
can't close completely, thereby letting too much petrol/air vapour into the cylinder
when you kick-start the bike. So if there is any friction when you open the throttle
then think about opening the carburettor and smoothening the movement of this
gate.
Open up the carburettor and check that the washer on the stopping pin
effectively closes off the petrol when the float tank moves up. Make sure the floats
can move easily. Also check that the floats are not cracked and that the stopping
pin is not jammed. All of these reasons allow too much petrol to flow into the
carburettor. Blow through all the holes you see in the carburettor and make sure
the jets are not blocked.
One last thing you can do is place a piece of thin wire in the hole at the bottom
of the main accelerator jet in the carburettor. This will decrease the amount of
petrol which can then get into the engine.
Cleaning the Carburettor
If dirt or muck gets into the carburettor then it can block the jets and inhibit the
creation of the spray so essential to the bike's running.
Square Carburettor
©Digby Greenhalgh 2000
Minsk Repair Manual
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Round Carburettor