FE-570 exhaust can

These came out of mine.....

From what I have read here and elsewhere, it would seem that the stock can on these bikes, while quiet, is restrictive and as a result exacerbates the heat under the tank issue. A lot of guys have put the FMF pipe on and report their bikes run cooler.

I don't want a loud exhaust and I also don't really want to buy a slip on either. The end piece and tiny very restrictive looking screen disc "thing" are definitely coming out. After doing that, I plan to ride it and see. I may take the sleeve off the stock can and have a looksie. Got a pop rivet gun and I am not afraid to use it :lol:

If I do go into the pipe, I will take pics and post them up with any mods / results that occur.

Really, as long as the stock can is, a 2" perforated straight through tube with glass pack and a FMF turbine vane spark arrestor on the end would be perfect. No need to overthink this thing...

edwaters said:

wow does the big piece have a small hole in it?

will it effect an engine with all the emissions on it? My Fe is a 2011 out here in cali.

Will it make the engine run lean or does the fi compensate for less back pressure?

Also how loud is it?

waters

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The large part in the photo is filled with a tightly meshed screen and is listed as a catalyst so must offer some back pressure. I think the small disc is what you guys call a spark arrestor.
Along with these exhaust parts an air valve with a rubber pipe (secondary air system) on it and a large plastic baffle plate were also removed from the airbox. The parts were removed by the dealer before collection but I don't know wether or not they did anything with the ECU or engine maps.

Sound is quite deep but certainly not loud

"Sounds" good to me. Hoping to avoid the aftermarket can honestly. My experience with aftermarket pipes is they are lighter, sure, but as a result they damage more easily. The Yosh can on my last bike got smashed in good and it was not even the result of a crash. Just cut it a little tight around a tree, got a bit happy with the throttle, back end stepped out a bit and bam! You know, typical dirt bike riding! Heavier stock cans tend to shrug off such abuse better

I'm using the FMF Factory 4.1 Titanium Slip-on as a replacement for the stock exhaust on my 2011FE 570.
It's lighter and more compact than the stocker and the motor runs much smoother and cooler with it.
The exhaust note is perfect, not that loud at all. The stock pipe is way too restrictive. I also installed
the additional spark-arrestor we need in our area of high fire danger.

I also have the FMF 4.1 great pipe with good sound and you can run a 140 and it wont hit. :mrgreen:

Sorry im getting off the topic a bit but I have the Akra can on my 570 and it still gets hot in tight stuff. Nothing the thermo didnt fix. Back presure is hardly different. Good pipes should be the same strength as stock can. Sounds like you should get a new end cap?

pegscraper said:

The large part in the photo is filled with a tightly meshed screen and is listed as a catalyst so must offer some back pressure. I think the small disc is what you guys call a spark arrestor.
Along with these exhaust parts an air valve with a rubber pipe (secondary air system) on it and a large plastic baffle plate were also removed from the airbox. The parts were removed by the dealer before collection but I don't know wether or not they did anything with the ECU or engine maps.

Sound is quite deep but certainly not loud

Click to expand...

I have been told that the 'catalyst' part is not in the USA exhaust systems.

Beyond that, the end piece (with all the holes in it), I have gone to some trouble to make sure it stays in. I want it to serve as a spark arrestor. I know it isn't certified, but from the design it looks like it would do the job. If it comes out then I will get an aftermarket tip that has a certified spark arrestor in it. There are a lot of neat forests around here and the last thing I want to be responsible for is burning them down.

Beyond that, on the trail, my bike has more than the needed power for my skill level, so I don't feel the need to replace the silencer at this point. If I get some SM wheels/tires I may get a different silencer for more power, but that isn't in my plans right now.

Unless people have a temp sensor and can prove the running cooler claim, I ain't buying it.

I do have a laser thermo sensor and it is running cooler!

Barshoe said:

I do have a laser thermo sensor and it is running cooler!

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I put a 4.1 on my FE450 and I love it. I run the quiet core with spark arrestor and have all my pipe wrapped. Texas is a tinder box right now, so I'd hate to have the header pipe get near some brush right now!

Nice wrap job!

I took my pipe apart and learned over on KTM Talk that that these bikes either come with a KTM style can or a Husaberg can. Lucky for me mine came with the KTM can. The KTM can is a straight through design, with a turbine style spark arrestor. It is simple to mod for better flow while still retaining spark arrestor capability.

Here are the pics.



Front section



Front view of spark arrestor



Rear view of spark arrestor



I wound up removing the star nut and restrictor disc thingies from the end cap and shortening the tube on the end cap back to the angled brace visible in the top photo. It seems to flow well, my guess it is on par with an FMF Q. It is louder, but not bad. Perfect thumper sound actually, to this rider's ear.

This is the Husaberg style can (from the manual)



The cans have different part numbers on them, the KTM one is stamped Husaberg, but also "KTM Krizman spark arrestor". As you can see from the diagram, the Husaberg can is a bit of a nightmare. If I had one of those, I would just replace it with an FMF straight away. You could shorten the end cap tube way down, but then it likely would not be effective as a spark arrestor.

Gotta love the torx screws holding these things together. No pop rivet hassle 8)

Hi,

Does anyone know if a stock can from a 07 250 SXF will fit the berg?

Those with the FMF 4.1, how much louder would you say it is than the factory can? 10 percent louder? 20 percent?

Back to the title of the thread, I'm unclear about what modifications can be made to the factory can besides simply removing the screen at the aft tip. Could somebody please be specific about the mods they've made, and comment on results?

I have one and I don't consider it any louder then stock.

Barshoe said:

I have one and I don't consider it any louder then stock.

Click to expand...

Somebody in another exhaust thread makes the claim that a "reflash" is necessary if you change from the factory can to the FMF. In your experience with the FMF 4.1 is this true or false?