Exhaust mods?

[D3ALN]

My bikes really quiet is there anyway I can make it louder? maybe get a little bit more performance. I will post pics tomorrow night.

[p.dath]

It's an off-road motorcycle, and assuming you are only using it off road, you don't really have many regulations to comply with.

Have you been to your local dealer and asked them about performance exhausts you could buy?

[F5 Dave]

It's an off-road motorcycle, and assuming you are only using it off road, you don't really have many regulations to comply with.. .

Which is why we keep losing land to ride on because people think they can make as much noise as they like. They also think it will help it 'breath' & that will unleash untold power. 4 strokes make a barratone noise that goes for miles.

Keep the thing stock, or if you must buy a quiet aftermarket pipe.

-Heck spend the money on suspension & tyres & have a much better bike.

[bogan]

Not sure why you would want it louder, but different can lengths and sections give different sounds. Stock it should (maybe?) be a tuned, open can, so don't think you will see any performance gains.

It's a dirtbike though, so the fun is in riding it not listening to it!

[vr4king]

There right a loud bike is no fun at all...........

[CRF119]

Loud doesn't always mean more power, Also motor Cross bikes do have to comply with noise regulations at the boundy of the property.

Nothing worse then a noisy two stroke or 4 stroke that sounds like shit.

Muffler length affects performance but wont always give your more power, a lot of the time it just moves the power further down or up the rev range which sometimes gives the impression of more power but really over all little or no gains have been made.

What bike are you looking at putting this on?

Ive had experiance with 2 and 4 strokes.

[D3ALN]

my wr250f. it is very quiet. my mates honda 150 is louder it got a little pee shooter exhaust. I will post pics tomorrow.

[orangeback]

http://www.trademe.co.nz/motors/motorbikes/parts-for-sale/exhaust/auction-396115387.htm
i had the yz pipe on my wr450 it will make a difference, i assume you've got the stock s/steel pipe that is the adr compliance pipe, fit the stock yzf250 pipe you'll be happy and wont cost you much ? >150

[Jinxycat]

hit the wr free mods section at thumpertalk

[orangeback]

hit the wr free mods section at thumpertalk

http://www.thumperfaq.com/free_mods.htm

[D3ALN]

cheers for that. will try find a yz250 pipe

[DrunkenMistake]

My bike wasnt offroad its a road sports bike BUT,
It sounded like a sewing machine and was about 2db. .. could hear indicator clicker it was so quite ..
I just rode around screaming "BROOOOM BRRROOOOOOOOMMMMMM BRROOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM....HONDA HONDA HONDA HONDA..DA..DA..D....Fucking Honda... START!"

Its a cheap mod?

[D3ALN]

Heres a pic of my exhaust any suggestions?
243864

[DrunkenMistake]

Heres a pic of my exhaust any suggestions?


Debaffle? would be the easiest.

[D3ALN]

Debaffle? would be the easiest.

how do i go about this there is no bolt to unscrew?

[DrunkenMistake]

Uh right, I should have gone in depth a little more,
If you know an engineer it may help, basicly they cut the end off the can, rip the baffle out of the inside, and re weld. More or less in that fashion. I personally have never done it, so im not sure.

[D3ALN]

Would it help if I plasma cut the whole bigger? just dont want to cut the whole baffle out yet. As I dont really want to pay an engineer to weld it back up if Im going to try find a yz250f one.

[CRF119]

You need to run a whole new tube down the middle which you can buy from any muffler shop and you will need to weld it to the end cap. You wrap that tube in muffler packing and slide it back into the can. Easy.

Or i would skip all the hassle and keep an eye on a pipe of a standard YZF250 from the same or similar year.

Or buy a new one http://www.torpedo7.co.nz/products/P0S9SN1T4/title/pro-circuit-t-4-slip-on-silencer

[D3ALN]

Would it help if I plasma cut the whole bigger? just dont want to cut the whole baffle out yet. As I dont really want to pay an engineer to weld it back up if Im going to try find a yz250f one.

cheers will wait for a yz250f one to pop up

[oldguy]

This is what I did,

http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243932&d=1312358711
stock pipe
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243931&d=1312358702
removed end cap
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243937&d=1312358831
Pipe removed
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243946&d=1312358848
made a new pipe and plate
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243965&d=1312358902
can still use sparkarrester, if need be.
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243936&d=1312358816
new pipe fitted
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243930&d=1312358693
looking good if i do say so myself, looks like stock.

[oldguy]

After all that work I then did this.

http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243996&d=1312360735

DMC AfterBurner awesome pipe.

[D3ALN]

This is what I did,

http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243932&d=1312358711
stock pipe
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243931&d=1312358702
removed end cap
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243937&d=1312358831
Pipe removed
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243946&d=1312358848
made a new pipe and plate
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243965&d=1312358902
can still use sparkarrester, if need be.
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243936&d=1312358816
new pipe fitted
http://www.kiwibiker.co.nz/forums/attachment.php?attachmentid=243930&d=1312358693
looking good if i do say so myself, looks like stock.
My boss did the same to his but your pipe and his pipe are the same but different to mine. Mines pictured on the first page.

[Shadykiwi]

As some have said be careful with your noise levels. My club has been warning us for a while that they intend to start measuring dbl's. I think the limmit is 19? (Could be wrong on that number). Also your bike never sounds the same when riding. I used to think my YZ250F never sounded like the other bikes in a race, however my mates all swear it sounds excactly the same.

[D3ALN]

If I put a shorty on will I need to get the jets redone?

[Jinxycat]

If I put a shorty on will I need to get the jets redone?

if you free up your standard pipe then yes you will, maybe save up for a slip on and a jet kit, like a JD or dynojet, i would advise against a mx cos the cheap ones could be as loud as 104db, maybe something that comes with a "quiet insert" you really need to be down around 94-98 db

[Padmei]

Got the exhaust on my DRZ/KLX400 measured by my mate today. It was around 100db at idle with a peakof 114db at around 4K. That is bloody loud.

Now I personally like loud pipes (I put a R1 pipe on my KLR650 & it sounded awesome) however this one is too loud for me. My bike came with the pipe but now I want to change it & the jetting back to stock as I was only getting 100K out of a tank of gas.
I guess what i'm saying is borrow or try a pipe on it befre you commit to it.