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How to make FE650 more silent?

Joined Aug 2015
8 Posts | 1+
Sola, Norway
Hi folks, I have an FE650 that I can hardly use because it is no noisy. I don't worry about it myself but neighbors would call the police.... Last time I took it through town I got the police on my tail... Over here you are not allowed to ride in the woods or the outback so making a lot of noise is not a good idea.

So it is a FE650, it has the original muffler with all the choke stuff in the exit removed. The "choke stuff" was out there to reduce the HP upont import to about 13 hp for tax reasons... So now you can see right through it. All the padding (the fluffy stuff) is intact so nothing more to gain by working on new padding. But is is very loud. You can her me coming miles away.

On tracks I see lots of other guys riding powerful 4-stroke bikes that are real quite, even on racing bikes. So there gotta be something out there that can be used. New muffler I guess. Bigger maybe? WHat to get, where to source?

Good hints and recommendations appreciated.
 
I've looked a bit into this. Apparently with respect to the size of the muffler, the LENGTH is most important for quiet vs. not quiet. But the internal design of the muffler matters the most!

On my Suzuki I have a nice CRD exhaust system. It's got a nice deep voice but not too loud at all. That design has about 2/3rds of the muffler as a perforated core with packing, and then the last 1/3 of the muffler ends in a chamber with two kind of staggered/offset pipes. I believe this breaks the sound wave.

The FMF Q4 mufflers and the Husaberg 2009+ mufflers are also designed like this I believe (at least some models).

The 570 muffler is actually really super quiet!
 
Interesting

Interesting. Would like to see drawings of such a design. My muffler you can see right through, and if I rev it up a lot and close throttle I get 15 cm flames coming out. Looks real cool in the dark... But maybe I need to redesign the interior of it a bit. Don' think it can be much longer though.

I was thinking maybe a twin muffler design could work to give it more volume.
 
in here is a pic of the second-chamber type muffler: http://husaberg.org/exhausts/13760-fe-570-exhaust-can-2.html

(the 570 muffler pictured there is more complex than my CRD and is quieter too ... arguably too quiet!, quite a few threads here on how to make 570s LOUDER :) ... the crd has fewer curves in the pipes and is less "dense" with parts so to speak, ie not as crammed)

twin mufflers ought to work very well :) but is probably slightly heavy in comparison - Y joint, fixtures, two sets of start and end caps - so unless it needs to be as quiet as possible I'd go for a good decently quiet single muffler
 
I have an E-1 can that is in decent shape I can part with. It's a bit quieter than the krizman spark arrestor which is going to be quieter than an open exhaust.
Around 150 hours on it.
It's similar to this one, in design. It's oval, whereas the 570 exhaust is 6 or 8 sided I think. It has a similar dog-leg that the gasses need to get around to escape.
That u-turn qualifies it as a spark arrester I believe.

Exhaust.jpg


It came off my FS 650e 2005 model.

As far as your fire breather, you had better get that fixed before you start the forest on fire.

I have a parting out advertisement here in the classifieds.
If you think you would like the silencer, let me know and I'll chuck a picture up here:

http://husaberg.org/classifieds/20791-2005-fe550e-fs650e-parting-out.html
 
It's a tunable exhaust cap that was very popular a decade or two back.

The more discs you use the more flow you get, more power possibly...and more decibels.

Fewer discs make it quieter.

Enabled you to ride your street bike without being overly obnoxious and open it up for the track.

Idk if jetting would need to be changed, it would make it richer.

Decel popping could be virtually eliminated by disconnecting the TPS.
It won't hurt anything and it's free.

Maybe keep it under 3,000 in your neighborhood, and 4,000 rpm's untill you get out of town?
I know... That's no fun.
 
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