MINSK Repair Manual page 27

For both carburettors, turning this screw clockwise limits the amount of air in
the petrol mix, and turning it anticlockwise increases the air in the mix. As with
the idle screw, the engine's pitch is affected by turning this screw – clockwise
makes the engine run lower, anticlockwise makes it run higher.
Every bike needs to have its petrol/air mix in the right proportions. This ratio
can change from bike to bike as climate, engine characteristics and petrol all have
an effect. Getting the right ratio requires both the air mix screw and the idle screw
to be adjusted. It is a job best left to a mechanic as it takes a seasoned ear to
recognise the right engine pitch when the mix is just right.
(5) Adjusting the Height of the Accelerator Pin
The long pin inside the accelerator jet can be adjusted into a higher or lower
position with respect to the end of the jet by unclipping it from the top of the gate
in the carburettor and moving it into a different groove. Moving it down increases
the amount of air in the mix and moving it up increases the amount of petrol in the
mix. This adjustment is best left to a mechanic as it need only be done should the
end of the pin become worn after long use.
©Digby Greenhalgh 2000
Minsk Repair Manual
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