850 carbie tuning

[jimmy_mangat]

hello ladies.i hv a problem to tune my carburetor.does anybody know how to tune the carbie (air needle one) my car also jerking like hell.i dunno maybe too rich or lean.before this i change the mainjet to big wan.how to adjust the air needle? how many turn open or out? low rpm oso very jerking and more fuel.all type of spark plugs hv been try.

 

[t_trax100]

currently how ur rpm reading when idle?

 

[yeoh]

i use screwdrive to tune my carb ...