Today I was out on my 2018 Lowrider. I don't usually ride it hard but today was a bit of an exception. Today I noticed when upshifting at over 4000 rpm I was hearing a loud raspy noise when I got off the throttle to upshift. I first thought that I had a real issue and was very concerned that was until I realized that the noise was the gas cap rattling during shifting at rpms higher that 4000 rpm. Imagine my relief when I realized the noise was only the gas cap.

 

It's a known problem.

Gas cap rattle

 

My Breakout has the same problem. I'm thinking of changing it for a locking cap.

 

 

Look here.

https://www.hdforums.com/forum/softa...g-gas-cap.html

 

common problem for sure, along with the condensation under the speedo glass. I have both issues. for the fuel cap, I flipped it over on some soft cloth, took a hammer and flathead screwdriver and punched the inner lip of the chrome looking piece down so it doesn't spin freely (and vibrate).. simplest way to fix it, and it works. I hate the look and feel of the cheap stock caps.

 

after 2 warranty replacements did the same thing, I used some channel locks to crimp the metal rim above the o-ring. now it is quiet. I find it almost unfathomable, given Harley's problems, that they haven't fixed this yrs old problem. sometimes I think they are blinded by a captive market that existed until a few yrs ago. same with the oil breather/air cleaner puking. no other manufacturer has the problem, and they all need to breathe from the crankcase. It makes you wonder..............

 

yea mine did it but I didn't know what it was so I shimmed up everything that could rattle gasket papered anything a little drummy and it still rattled , til I put my hand on the gas cap