Before using carb cleaner and compressed air wash the carburetor using brushes and if possible, use ultrasonic cleaner as well.
Main jet and Pilot jet
Spray carb cleaner or other type of solvent through the main jet and pilot jet. The main jet is 0,5mm and the pilot jet is 1mm. If anti surging jet is mounted (as on the picture) the pilot jet is reduced to 0,8mm
Clean well using solvent+compressed air and use a string at proper diameter for cleaning.
Pilot pipe cleaning
Mount the pilot screw before proceeding
Mount the pilot screw. Fully in, then 2/4 of a turn out again.
Spray carb cleaner into the pilot inlet. Make sure it’s a good flow throgh the output.
Clean the fuel inlet using a brush and carb cleaner. Use compressed air to clear.
Clean the starter jet as well. Hold your finger at the top and flush the jet. This can be quite often blocked.
Pressed in starter jet
Check to see you have a good flow through the pressed in starter jet.