Joined Aug 2017
43 Posts | 15+
Australia
I've just removed the stock muffler and fitted a FMF muffler. I now have a whistle when backing off the throttle and I can't seem to get rid of it.
The muffler has a choke ring fitted in the outlet. Take it out and the whistle goes away. I have done a bit of checking and found the muffler has what FMF call RTS which stands for Rapid Tuning System. My thoughts are that changing the size of the choke ring will change the back pressure/shock wave but I can't find any information on it or any interchangeable rings.
Has anyone had anything to do with it and had a whistle which is now starting to annoy me.
Thanks Lance
The muffler has a choke ring fitted in the outlet. Take it out and the whistle goes away. I have done a bit of checking and found the muffler has what FMF call RTS which stands for Rapid Tuning System. My thoughts are that changing the size of the choke ring will change the back pressure/shock wave but I can't find any information on it or any interchangeable rings.
Has anyone had anything to do with it and had a whistle which is now starting to annoy me.
Thanks Lance