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The best thing you can do is look in the DIY help forum under the fuel/carb related and you'll find some great articles there with pics. I have my 1200 jetted to a 45 slow and a 170 main and a thin needle and I run the screw turned out to about 2 turns. Read the jetting sections and you'll learn alot.
You should remove it and install a s & s cycle super E carb. I'm having the same problem with my wife;s 2006 sportster as soon as get some cash together i'm buying a super E
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I had the same problem when I got my 2005 Sporty with 2000 miles. New to Harley at the time. Turns out I didn't know I was supposed to use premium. Someone pointed that out on this forum. I added an octane booster to the existing fuel in the tank and started using premium. Problem solved completely after two tanks.
I won't mention the three hose/one hose gas pump issue.
