Husqvarna 250 PS Workshop Manual page 18

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If the carburettor is very dirty the chamber under the
blind plug must also be cleaned. Drill a small hole in the
centre of the blind plug and carefully prise it out. Clean
the carburettor housing and blow all channels clean
using compressed air.
Assembly
Fit a new blind plug. Use a suitable mandrel to drive in
the plug and give an airtight seal.
Inspect the throttle flaps and their spindles for wear. If
they are worn it will be difficult to set the idle speed.
Always replace the flap and spindle at the same time.
Make sure the flaps are fitted correctly.
Fit the various components of the metering unit in the
reverse order to removal.
NOTE! Make sure the lever springs are replaced the
right way round
Check that the lever is level with the top of the
carburettor. Adjust the lever if necessary.
If lever is too high = too much fuel.
If lever is too low = too little fuel.

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