I have a 1975 XLCH Sportster. Just recently got it running. Cleaned tank and coated and then rebuilt carb. Started up fine and ran. Now I am having some cold start problems and when I get it running it seems to run rich and then dies from 5 to 10 seconds. I can't seem to figure out my problem.. Any suggestions?

 

What kind of carb are you running on it?

 

Bendix-original carb

 

It sounds like either the float is hung or it's not set at the proper height. What is your air/fuel screw set at? What did you set your float level at?

 

Pull the plugs - what do they look like ? Have you checked for a vacum leak ?