Hello Today I tried to set the pilot air screw in Mikuni HSR42. In the Mikuni manual we can read: "The pilot air screw is set at two turns open from the factory. This is the position we have found to be correct most of the time. If the screw position has been altered, gently bottom it and re-open it two full turns. Next, run the engine until it reaches normal running temperature. With the engine idling smoothly, adjust the pilot air screw in slowly until the idle either slows or becomes irregular, then turn the screw out until the engine again slows or begins to idle irregularly. Count the number of turns between the two positions. Set the air screw mid-way between these too-rich and too-lean positions." I tried do like this so I set two turns out and set about 1000 rpm. Than I adjusted screw in and after 1 turn in the idle risen to 1300 rpm, after 1,5 turn in was about 1450 rpm, two turns in (bottomed screw) it was again about 1000 rpm. All time idle was regular and it didn't slow. Than again I re-open air screw two full turns and I started turn the screw out. After 1-1,5 turn out there was about 850 rpm and when I screwed it out it was still about 850 rpm. But all the time the idle was regular. So how to set it???? I know that these factory Mikuni settings are for "normal" Harley. I have "normal" air filter but my pipes are just stright tubes. The pipes are oryginal but without connection between them. Than there are stright pipes about 22 inch lenght and 1.75 inch diameter. Is here anybody who really know how to set it, anybody who did it before??