Mixture screws sigma jetkit

I have installed a sigma jetkit and got rich fuel conditions. Is there enybody that have doen this before? How many turns out is your mixture screws?

 

jet kits are usually for bikes without stock air filters so they pass more fuel. pod air filters take a lot of tuning and might never run as smooth as stock.
hate to say it but best bet is go back to original jets and filters, then it's just a matter of having clean carbs

 

Sigma sells multiple kits. Which jets did they supply in yours?

 

I have installed the pilotjets 45 and mainjets 115 . Just one washer under needle and drilled the slides. Runs great if run hard but normal crusing will make plugs fail after a while. Engine is in stock condition.

 

I think the pilotjet 45 size is too big. After talking to Sigma jets I was told the extra fuel comes from the needle and not the pilotjet. So first I will try to remove the last washer under the needleholder to test.

 

I've used the 6Sigma jet kit on my XJ650. I started with 45 pilot and 150 main but was too rich. Ended with 42 pilot and 125 main. Took a fair amount of work, also note if you have an XJ650 then don't use what I have as I have made many other mods to stock. Have you checked that your choke isn't passing? This was an early issue I had.
Without knowing your engine sepcs is difficult to give you an accurate answer

 

Also, be aware that some aftermarket jet manufacturers do NOT use the same size designations scheme as Yamaha (Hitachi or Mikuni) did.

- on Hitachi fuel jets, the numbers refer to the actual physical size of the passage hole expressed in millimeters, i.e. a #114 fuel jet is 1.14mm in diameter, a #42 fuel jet is 0.42mm in diameter, etc. Hitachi air jets are a whole different animal, and air measuring airflow volume at some (unknown) specific level of vacuum, and thus there is no direct (easily computed) relationship between the air jet passage diameter and the Hitachi "size" on their air jets.

- on Mikuni fuel jets, the numbers are a measurement of the volume (cc’s of gasoline) that will flow thru the jet when poured in from a height of 50cm. There is no direct (easily computed) relationship between the jet passage diameter and the Mikuni "size" on their air or fuel jets.[/b][/b]