*** If your jet does not measure like ours do not buy it because it will not work **** Please take a moment right now to measure the jet prior to ordering. If needing help send us a picture of the jets removed from the carb and also read identify that jet. See also additional things to check before ordering. We have no control over jets once they leave us some customers drill them out, test and tune etc. Our year, make model fitment guides can assist but are not 100% accurate due to numerous reasons. Than there are stright pipes about 22 inch lenght and 1.75 inch diameter.****If your jet does not measure like ours do not buy it because it will not work**** The pipes are oryginal but without connection between them. I have "normal" air filter but my pipes are just stright tubes. I know that these factory Mikuni settings are for "normal" Harley. After 1-1,5 turn out there was about 850 rpm and when I screwed it out it was still about 850 rpm. Than again I re-open air screw two full turns and I started turn the screw out. All time idle was regular and it didn't slow. 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. I tried do like this so I set two turns out and set about 1000 rpm. Set the air screw mid-way between these too-rich and too-lean positions." Count the number of turns between the two positions. 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. Next, run the engine until it reaches normal running temperature. If the screw position has been altered, gently bottom it and re-open it two full turns.
This is the position we have found to be correct most of the time. "The pilot air screw is set at two turns open from the factory. Today I tried to set the pilot air screw in Mikuni HSR42.
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