Well I don't know about a Harley RK in particular, to me, a Harley isn't or doesn't have that draw without a louder set of pipes, and I think I'm getting kinda bored with the loud droning loud pipes bring on the hwy drives. but I am kinda dis appointed from the soft paint issue, and the light weight plastic in front, that vibrates under pressure of take off power. I still have my 1900 Stratoliner, and I'm not sure I'm ready to let it go. On it, I have a Roadhouse slip on muffler which brings plenty of rumble for me. My lady likes riding on the back of Stratoliner over the F6B. F6B is a fine bike though...I will need to decide soon. I don't have time or space for both bikes