I'm considering installing a Yost Power kit in my factory carb. This past July I purchased a 2005 Sportster. When I cruise at light throttle I can feel it running lean. Feels like wind drag pushing on my windshield, if that makes any sense. Anyway, can anyone give me advice on what might be the best size of jets to use? The bike is a stock 1200c, factory pipes but drilled out, altitude here ranges from 3500ft to 4500ft.