Originally posted by Adoika
Could somebody please point out for me the location of the different needles on the sirio carb. I just dont want to be mucking around with them and adjusting the wrong one! 
Also does anybody have any tips on adjusting the mid range needle? I've got the low and high ends down and want to start learning the mid range.
Cheers,
Doy
High speed needle (HSN) is located on top, where the fuel inlet is.
Low speed needle (LSN) is located in the end of the slide, where you attach your throttle linkage.
Idle speed needle (ISN) is located near the engine cylinder.
When tuning your Sirio carb DO NOT adjust the mid-range needle. This is set from the factory on a flow meter to help calibrate the other two needles and should not be touched unless you really really have a grasp on carburetor tuning. The mid-range needle can be found underneath the high-speed needle on the end of the carb opposite the low-speed needle.
Sirio .12 (General Base Carburetor Settings)
High Speed - 5.5 turns
Low Speed - 3-1/2 (Generally this should be flush with the end of the slide)
Mid Range - Flush then one turn out.
AFM