it´s hard to start most of the time (only had it two weeks) when i get it started finally she stalls out. I have 73 sportster with a s & s super B carb thats really i can say. When i finally got it running its was reving high 1500rpm to 2000rpm so i fiddled with the carb (im very new to this) i got it to idle at 1400rpm took it for a ride it backed fired and stalled and thats where i stand beside my bike not riding can you help me!!! it wont start.