Originally posted by geebeeez
Hello, Can anyone tell me what the base needle settings are for the sirio prpro onroad engine? How many turns out from closed on the high and low end? Thanks
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 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 .21 (General Base Carb Settings)
Low End: 2-1/2
High End: 5-1/2
Midrange: Flush then ½ turn out (if you have moved it)
We recommend the use of the following plugs
- Sirio .21: Sirio S001720127 Turbo plug or Novarossi C7TGF
AFM