I would like to thank the members of the forums for their advice, Iam not mechanically minded and when my new 2006 RKC was cutting out and backfirering I didn't know what to do but after reading the foruwm and downloading the HD fuel enjector page form, I took it in to my harley dealer and they changed the item. My bike now goes like a rocket

 

Hey thats why this Forum is great!!!!!!!!!!!!!!!!!!!!!!!

 

Just another case of online blogs doing their job. Good luck and glad it's running well.