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96db for everyone via the AMA
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Posted by: SFO---------------------

http://www.sharetrails.org/magazine.cfm?story=246

Posted by: JasonJ---------------------

I have not been following the Pipe saga and Im still running my WR stock with no baffle. I would like to get a decent pipe that makes the 96 db limit but I dont want to spend much $ on it.
Dose anyone know of a good tip or pipe I can put on the WR cheap that not only claims but DOSE meet 96 db?
Im not looking to race or gain more power here or there, I just dont want to notice less power anywhere. The place I ride has no sound limit and no one but the bares to complain but hey, I want to do the right thing as long as its practical.
I dont trust manufactures BS on pipes so if anyone has real world or credable info please share.

Posted by: Jon K.---------------------

Quote:

Originally posted by JasonJ

Dose anyone know of a good tip or pipe I can put on the WR cheap that not only claims but DOSE meet 96 db?

Jason; dig up your stock baffle and drill a bunch of holes in the end. You can "tune" the noise level by making them bigger until you get the correct balance between noise and power.
On mine; I also cut a bit off of the internal pipe (in the baffle) and welded it back to make it shorter.
Can't beat the price (free!!) and it worked for me. I did not even have to re-jet.

Posted by: marcusgunby---------------------

I wish they would set it lower than 96db as i find 4 stokes offensive noisy.

Posted by: bclapham---------------------

we have a SX track trying to open here in a built up area. they ran the tests on a bunch of stock bikes, a regular stock 2 stroke came well within the limits but a stock 426 was way over. a 2stroke with a PC shorty failed bad too. there can be no doubting that the 4 strokes make much more noise with a deeper sound that carries further- kind of ironic that 4-strokes are the new fad to meet the needs of gas emmissions, but they might shoot us in the foot with the noise emmisssions.

Posted by: JasonJ---------------------

Jon K, I have been toying with that idea. The only thing stopping me is that I use the stock baffel when I have the bike in the yard at home and I need to run it to change the oil or for any reason. But it might be worth doing as I dont run the bike real long.
IMHO a 4 storke is not louder than a 2 stroke at a distance. When I shut my bike off when riding and sit I can hear a group with 2 storkes and 4 strokes in it at a distance. I do think 4 stokes make more noise when ideling where 2 strokes just kinda bark when your on the pipe. 2 Smokes might be more quite with the stock pipe, but how many 2 strokes have you seen riding with stock pipes though?
4 stokes are the wave of the future, the exhaust tech just has not cought up yet but it will.
BTW marcusgunby, I now find 2 stroke exhaust smoke offensive irratating.

Posted by: MWEISSEN---------------------

Quote:

Originally posted by JasonJ
Dose anyone know of a good tip or pipe I can put on the WR cheap that not only claims but DOSE meet 96 db?
Im not looking to race or gain more power here or there, I just dont want to notice less power anywhere. The place I ride has no sound limit and no one but the bares to complain but hey, I want to do the right thing as long as its practical.

JasonJ, I ran a White Brothers Vortip in place of my stock baffle. This definately passes the 96dB limit (sound tests are mandatory in Michigan Cycle Conservation Club rides, and I passed at what I believe was 93 dB). With the Vortip, you can re-place your stock tip when you want super-quiet.

With the Vortip, the low end response is better than with the stock baffle in, and close to when the stock baffle is out.

My bike was a '99 WR, should be the same with newer ones.

Posted by: motometal---------------------

many people buy a loud aftermarket pipe with the excuse that their riding area is remote, and it won't bother anyone.  Meanwhile, the stock pipe probably gets thrown away, and when they sell the bike, the new buyer may ride at a public area, but chances are the new owner won't want to shell out the cash for a new pipe with a reasonable noise level.

I don't know about 4 strokes, but modern 2 strokes run very well with the stock pipe and silencer, and really don't need any aftermarket exhaust (unless the stock stuff gets ruined). 

Regarding the "I don't like the smoke" comment, a properly jetted two stroke burning good fuel emits minimal smoke.  The sheer volume of gas coming out of a four stroke is generally much greater (larger displacement), and is propelled a much greater distance out the back of the silencer.  Between that and the typical high noise level, I don't particularly enjoy following a four stroke on a trail ride.

Posted by: JasonJ---------------------

"I don't particularly enjoy following a four stroke on a trail ride."

Buy one and you wont have to follow anymore, you can be in the front

.
MWEISSEN I have herd of the vortip. Do you have a link for who sells it?

Posted by: Jon K.---------------------

http://info.product-finder.net/tt/W...tip-Insert.html

Posted by: Jon K.---------------------

Hmmmm . . . . I don't see anything for the 250 . . . . Oops!!

Posted by: JasonJ---------------------

I think the WR 4XX and 250fs use the same end cap so it should fit, that looks very interesting. Ill have to try that maybe. Thanks for the link.

Posted by: Highbeam---------------------

While the 4 stroke may have more displacement, it only fires every fourth stroke and at a lower rpm usually so the volume of gas should be far less.

Posted by: MWEISSEN---------------------

Baja Designs also carries the baffle:

https://www.bajadesigns.com/bajades...e.jsp?login=YES

Posted by: Rcannon---------------------

I think the environmental folks have us figured out. If they can continue to split us up into small groups they will have a much easier time getting us all kicked off of the trails.

The 2 wheelers hate the 4 wheelers. The two stroke people dislike the 4 stroke people...the list is never ending. Noise is noise. My personal opinion is not going to help the issue at all. Everyone who enjoys outdoor motorized sports needs to stick together.

Posted by: Anssi---------------------

The FIM noise level for MX is 98dB. Dirt Rider in their YZ450F exhaust test have the stock exhaust at 103 dB.

I understand the US and European models have the same exhaust. Are we talking apples and oranges (different kinds of measurements) here or will I have to get a Q exhaust to be able to race if they have noise level tests?

Posted by: motometal---------------------

highbeam, you made a good point, and I was probably wrong on that one now that I thought about it again.  I think the four stroke exhaust diameter has to be large because the displacement is relatively large and the engine still has only one stroke to expel the gas.  Two strokes may not have as much exhaust velocity, because the expansion chamber is a large volume of gas which can compress, and then come back to equilibrium after each exhaust stroke (smoothing out the pulses).

Jason, although I highly doubt that my crappy old oblolete 2 stroke is holding me up on the trail, if it is that's ok because I love it!  And the following of another bike is usually done by choice, not by necesity.

Very true that we all have to stick together on this one, believe me, I am constantly giving guys on two strokes with shorty silencers a hard time.,  I am not anti-four stroke, I am anti noise.

Posted by: WRSTEVE---------------------

JasonJ,
IMO it's way too quite and the cost is too high as well.
I just bought the GYR-T insert for 40 bucks and I felt more power in low - mid ranger area and you can get it from a local Yamaha dealer. and it passes just around 93-94 DB range.

Posted by: JasonJ---------------------

Whaaaaa? the GTY-R part is less than the Vor tip? See now, Im confused, this is where I would like to see a side by side review of bottom end power, cost, and actual sound test. But hey, for $40 some bucks I think next time I get to the dealer Ill order one up. The problem is my WR has been so rock solid I dont really get to the dealer much

Hmm now what do I need, Oh I know! my riding pants seem to have shruk some how this winter!

Posted by: Kawidude---------------------

About a year ago I put a White Brother R-4 pipe on my '97 XR400. I knew it was a bit too loud so I bought the White Brothers Quiet Core insert and popped that in there. I just barely passed the sound check at 96db. I'm not sure if this option would work for you, but I wanted to throw out another possibility.

Posted by: Jon K.---------------------

gyt-r link;

http://www.yamaha-motor.com/accesso...onid=5&pid=3644

Maybe it only fits the GYT pipe?:

Posted by: JasonJ---------------------

Oh yeah it dose say with Oval Muffler.
"Fit's YZ/WR250F and YZ/WR450F with GYT-R™ Oval Muffler."

I really dont want to drop the cash on a new pipe, I have the stock WR system on so maybe the Vor tip is the cheap way to go after all unless I start hacking the stock baffel. The Vor tip appears to have a supieor baffel design with the most outlet area and least restriction. It appears to truley be a baffel and not a restrictor.

Posted by: MWEISSEN---------------------

The Vortip is a baffle, and reduces sound by the un-equal-length tubes. I thought that it was a quality piece.

I thought Yamaha did indeed make a baffle for the stock pipe, but it sure doesn't look like it by the description.

Posted by: WRSTEVE---------------------

Quote:

Originally posted by JasonJ
Oh yeah it dose say with Oval Muffler.
"Fit's YZ/WR250F and YZ/WR450F with GYT-R™ Oval Muffler."

I really dont want to drop the cash on a new pipe, I have the stock WR system on so maybe the Vor tip is the cheap way to go after all unless I start hacking the stock baffel. The Vor tip appears to have a supieor baffel design with the most outlet area and least restriction. It appears to truley be a baffel and not a restrictor.

JasonJ,
The GYT-R insert is 39.95 @ any Yamaha dealer, and the Vortip is 61.95 @ the dealer. The GYT-R has the same baffel design as the Vortip, the only difference is instead of have 2 - 3 inches of pipe hanging pass the stock muffler, The GYT-R is flush with the pipe. Looks soooo much better. I'm telling you now, the Vortip is a waste of cash... get the GYT-R :D

Posted by: Jon K.---------------------

Steve; I think the question before us is:

Does the GYT insert work with the stock pipe?

Posted by: WRSTEVE---------------------

Quote:

Originally posted by Jon K.
Steve; I think the question before us is:

Does the GYT insert work with the stock pipe?

Here is my proof that it does fit on a Stock WR muffler

http://www.discoverymotorsport.com/detail.aspx?ID=384

Posted by: MWEISSEN---------------------

Yeah, the GYT-R end piece looks really nice! The one thing I didn't like about the Vortip was the curved end sticking out. It looked a little weird. However, I wonder how much the downturn on the end of the Vortip helped with meeting sound regs??

Posted by: JasonJ---------------------

I supose it depends on how the test rules are. If they go straight back from the level of the pipe or from the actual plane of the outlet. either way the downturned Vor tip should lower percieved noise by aiming the sound down where the stock and GTYR aim it at what looks like the optimal level to carry the furthest! Thanks for that pic of the GTYR tip, it dose look to fit the WR pipe but appears to have a smaller opening than the VOR tip. I still dont know but Im leaning tword the VOR tip for $20 more.

Posted by: Faded---------------------

Quote:

Originally posted by motometal
...I am constantly giving guys on two strokes with shorty silencers a hard time...

Motometal,

I have the name of someone you need to go visit...he cut his FMF Shorty silencer body down to 4" total length and runs it w/out packing, but is contemplating using raw steel wool. Not kidding either.

Posted by: motometal---------------------

one of my riding buds tried some different silencers, including a shorty.  finally i convinced him to go back to a stocker (it was free and i got the packing from my attick), and boy what a difference!  The bike sounds good again, and the power is better.

in my teenage years i made a homeade silencer out of a section of pipe and steel wool.  once the steel wool got coated with oil, it started on fire, and the flaming balls came out the back, sort of like the opposite of a spark arrestor.

Posted by: Faded---------------------

Quote:

Originally posted by motometal
and the flaming balls came out the back, sort of like the opposite of a spark arrestor.

Posted by: Jon K.---------------------

Quote:

Originally posted by motometal

in my teenage years i made a homeade silencer out of a section of pipe and steel wool.

On the Maico; I cut hacksaw slits all around the stinger, then welded a (Girling) shock spring cover over the end. Packed it with glass and had a pretty good silencer.

Posted by: markthomps---------------------

Back when I got a Suzuki TM100 Screaming Yellow Zonker (no silencer, as sold back then) I used a beer can with steel wool inside and painted the whole thing black to match the pipe. Then I used sheet metal screws to hold the whole unholy mess together. It lasted until I sold the bike a year later. Or was this the MX-125 Yammie that I did this to . . . Hmmm.

Posted by: Faded---------------------

It's nice to know my buddy is not alone in his steel wool/homemade silencer adventure. :confused:

Posted by: JasonJ---------------------

See, you want to use SOS pads instead of steel wool, the SOS soap keeps the oil from building up in the thing

. LOL.
Acutally some of this has givin me an idea, I have a RT 100 for my girlfriend with no silencer on it and I was wondering what I was going to do to get it more quite.

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