Husaberg
Go Back   Husaberg Forum > Mechanical and Technical > Exhausts

Exhausts Exhausts - Headers, Mid Pipes, Mufflers


Thanks Tree5Thanks
  • 1 Post By tourist
  • 1 Post By Lancer
  • 3 Post By TomTom
Reply
 
LinkBack Thread Tools Display Modes
October 30th, 2018, 03:22 AM   #1
Member
 
Lancer's Avatar
 
Joined: Aug 2017
From: Australia

Posts: 40
Thanks: 13

I Ride: Husaberg FE570
FMF Titanium 4.1 Muffler RTS

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
Lancer is offline  
 
October 30th, 2018, 06:42 AM   #2
Senior Member
 
tourist's Avatar
 
Joined: Nov 2012
From: Iceland

Posts: 2,300
Thanks: 752

I Ride: 1 Berg, 1 Zook
Interesting!

Are there gaps between the ring and the outlet body?

Does the ring have sharp edges?
Thanks from Alan
tourist is offline  
November 5th, 2018, 02:55 AM   #3
Member
 
Lancer's Avatar
 
Joined: Aug 2017
From: Australia

Posts: 40
Thanks: 13

I Ride: Husaberg FE570
Hey Alan,

There was a slight gap so I sikaflex'ed it in and it made no difference. I rounded the capscrew head and that also made no difference.

Place a finger beside the outlet when revving it and the whistle goes away.

I'm thinking of machining a small grove in the collar near the outlet to see of that stops it
Thanks from Alan
Lancer is offline  
November 5th, 2018, 09:30 AM   #4
Senior Member
 
Joined: Nov 2012
From: Sweden

Posts: 516
Thanks: 459

I Ride: HB 570 FE
The ring is there to reduce noise level, Ive done some fiddeling with the size in the dyno and 35mm inner diameter is sufficient for a 570, identical output through the range but lower noise by circa 3db, no mapping changes required.

Ive had whistle from the holes left over when NOT using an insert, and its the same phenomena as when you blow on a top of a bottle.
Id take out any sharp edges (unless you already have). Good luck
Thanks from tourist, Alan and Lancer
TomTom is online now  
November 7th, 2018, 12:48 AM   #5
Member
 
Lancer's Avatar
 
Joined: Aug 2017
From: Australia

Posts: 40
Thanks: 13

I Ride: Husaberg FE570
Originally Posted by TomTom View Post
The ring is there to reduce noise level, Ive done some fiddeling with the size in the dyno and 35mm inner diameter is sufficient for a 570, identical output through the range but lower noise by circa 3db, no mapping changes required.

Ive had whistle from the holes left over when NOT using an insert, and its the same phenomena as when you blow on a top of a bottle.
Id take out any sharp edges (unless you already have). Good luck
Thanks Tom.....I'll try chamfering the sharp edges
Lancer is offline  
November 9th, 2018, 04:30 PM   #6
Member
 
Lancer's Avatar
 
Joined: Aug 2017
From: Australia

Posts: 40
Thanks: 13

I Ride: Husaberg FE570
Hey Tom, I cut a small chamfer on the outlet of the collar and the whistle is gone...Thanks for your input
Lance
Lancer is offline  
Reply

  Husaberg Forum > Mechanical and Technical > Exhausts

Tags
fmf, muffler, rts, titanium



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale: Akropovic Titanium header FE390/450 w free muffler! CycleBuy Classifieds 2 February 5th, 2016 04:25 AM
For Sale: Akropovic Titanium header FE570 w free muffler! CycleBuy Classifieds 0 February 3rd, 2016 10:41 AM
Titanium Bolts RM9155 Husaberg 6 April 7th, 2009 01:59 PM
Big titanium valves.. arishusa Mechanical 7 April 2nd, 2009 12:50 AM
Titanium parts? DezDuster Husaberg 17 November 14th, 2004 11:20 AM


Facebook Twitter Google+ RSS Feed