If it's a carb model, try increasing the size of the pilot (low speed) jet to a 42 or 45. And pull the sheet metal plug out of the idle mix screw well so you can adjust the idle mixture. Start at about 2 turns out from all the way in. A Yost power tube or similar kit will have all the instructions and parts you need. If it's a fuel injected model...good luck. Harley has problems with their FI. You can get the dealership to re-map the ignition and fuel parameters, but it's kinda hit or miss.
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