Quiet Muffler for a Yz 426?

[ssuperbike]

Is there such a thing? Will the FMF Q sieries pass a sound test (94 db) I have a power core 4/2 that was supposed to be quiet but it is like 104 db!!! I do not want to be the bad guy but I am not selling my bike. Ideally I would buy the Quiet end cap and baffle for my bike and just stuff it up when I need to like trail riding. I sure could use some Idea's. I can't afford to throw away a bunch of money. KTM seems to have a decent set up that does not bone its bikes out horribly. The technology has to be out there? ---Mike

 

[biglou]

I think the FMF Q is relatively quiet. Also, look in the product review forum for CAL's review of the Moose silencer insert. It is a repacking cartridge that just slips into the can to replace the original packing. I don't think it is specifically designed to be quieter, but it is at lower RPM's. And, I think White Bros. makes a tuneable exhaust system that you can change the number of disks in for more low end, etc... All worth a look. I believe the Arrow pipe is quieter than stock, too.

 

[380EXCman]

I believe Promoto billet is making a quet end cap now. Also make sure you repack you silencer on a regular basis. The european stuff works better because of the bigger/longer canisters. I put a Big Gun on my Husaberg because I needed a spark arrestor and ProMoto did not have an option for me(they do now). I tell you what. I got a spark arrestor and a really loud pipe that weighed the same as the stocker. Big Gun does have a queit core as well and you may consider that as an option as well...

 

[ssuperbike]

I would like to do something with the FMF, if that does not work I will look at a new pipe. I will give them a call and let you guys know what they say.---Mike

 

[SFO]

I know in norcal the noise is the issue with blue bikes.
Blue bikes on the trailer/truck bring the ranger running with the sound meter.
CRD has a 91db pipe, they claim, that is undergoing USFS testing right now.
As soon as it has the stamp I am in.

http://www.crd-international.com/framesete.html

 

[ssuperbike]

That system looks sweet! If I can get 91 db without turning it into a bone at low to mid rpm I am on it!!!!!! I am going to find out all I can on the web. FMF does not seem to care. ---Mike

 

[ssuperbike]

I will have the CRD in a coupleweeks! 91 dba more torque low to mid. I am on it! ----Mike

 

[xr600r]

I WOULD BE INTERESTED TO KNOW HOW THIS WORKS OUT SSUPERBIKE.
I HAVE A 03' WR450 COMING INTO TOM'S, IT WOULD APPEAR IN THE PICTURES THAT THE THE WR IS STILL AS PLUGGED UP AS EVER, WITH THE STOCK SYSTEM.

 

[woods_rider1]

While I dont have a recommendation on a pipe/silencer for you, I applaud your conscious effort to do your part in responsible sound management! I only wish more riders would do the same. I love dirtbikes, but I HATE obnoxiously loud dirtbikes 2 stroke or 4 stroke. I hate to say it but we will be the bringers of our own demise in this sport.

 

[kciH]

SFO..
Are you going to give us dyno charts to see the power characteristics?? :)

 

[cetris]

woods_rider1,

How is the sound level of your 250? I had a 360 M/XC that was LOUD. I tried a bunch of different stuff in an attempt to quiet its bark, but nothing really made a significant difference. I replaced the stock pipe with an FMF with a Turbine Core II silencer, it helped the performance a lot, but it was just as loud as the stocker. That and the vibration were the only two things that I didn't like about it. I am considering a 300 now, I hope it is quieter and smoother than my 360 was.

 

[woods_rider1]

cetris
my 250 is not loud at all, I repack my silencer on a regular basis, and run the stock S/A. I have never had it tested on a meter but listening to my own bike and observing riders around me it is comparable to any modern 250 mx'er (which i find to be acceptable) I have seen some 70's era 2 stroke mxers which were horribly loud as well as the "I just bought a new 4 stroke so I have to get a loud silencer to gain those extra 3-5 hp at WOT" types. That CRD system sounds like the hot ticket, kill 2 birds with one stone. One note of interest, when I installed my carbon fiber pipe guard the bike sounded like a totally different animal, I couldnt believe how much the carbon fiber suppressed the noise from the expansion chamber!!

 

[yzeater]

Look at this from the CRD website...sure looks quiet

 

[SFO]

Originally posted by kciH
SFO..
Are you going to give us dyno charts to see the power characteristics?? :)

I am waiting for the USFS stamp on the pipe.
I'll run a vortiped stock pipe until I find something I like.
Sure, I'll be running it on the dyno if I get it.
Still haven't decided on the new bore and stroke and rod ratio though.
It will not be stock so I am uncertain if it will reveal much about how it would work on a stock bike.

 

[RakO]

Originally posted by yzeater
Look at this from the CRD website...sure looks quiet

They rae a little bit on the heavy side but ....more torqe and SUPER QUIET !!!
maybee less 500 Pm on the top . (Overrew)
Fantastic product used by Stephane Peterhansel Worls Champion and my self
the champion of my street OH no not even ...
RakO