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What exhaust system should i put on my WRF250?

Std! The way they come is fine. Lots people have changed the tip and other bits, but ive done nearly 11,000ks as it left the dealer. Never had to rejet or touch a mixture screw in the hole time ive owned it. Dis connect the magical grey wire and your a way. Just my appion, ive never made it up a hill due to a lack of grut! Only a lack of talent! And if you believe some people around her im suppose to be an expert rider? Al

keep plugging away Al, if you stick at it maybe one day you will be as good as me (at falling off that is) !

Come on Al I don't think your an "EXPERT" cause "x"is an unknown quantity and "spurt"is a drip under pressure ??? that dosen't sound like you ;)

Yamaha make a good system. But seriously why do you want to change it? I have seen quite a few wrf250's with after market exhausts. Most of them made a little more peak power. However, most of them really struggled when things went vertical (hills). They just seemed to lack torque and stall easily. I have even seen the same bike ridden by the same rider on the same tracks really struggle after fitting a new pipe.
If you just want more noise, try a pro circuit T4. THEY ARE REALLY LOUD!!!

Yeah thnx for yr input and comments Aaron and AL. I did have the grey wire cut, i just wanted a bit more power from it. So the pro circuit t4? whats the db ? Do i get the slip on? header? Feedback much appreciated... thnx  ;D

Im trying Marc, i just keep woosing out at the bit were you hit the ground. I dont know if its for me? I remember when you were 6 ft tall and now look at what all those impacts have done? Al

My 03 WR250F came with a Big Gun exhaust when I bought it 2nd hand 12 months ago and I don't think it makes that much of a difference, other then it screwing up the jetting.

I remember talking to Pat (Dirtpilot72) one day about his WR250F before he sold it and he swore by a stock WR pipe.  I have heard of some riders sourcing 2nd hand YZ250 exhaust for them which is possibly lighter and apparently (I can't vouch either way) gives more power, but again probably not the best bang for ya buck.

I too did the grey wire which I noticed helped a bit, but honestly the best thing I did was re-gear the bike, dropping from a 14 to 13 tooth sprocket on the front (standard 52 on the rear) on advice from Pat, the bike has better power outta corners and almost never stalls up hills now (but did loose a bit of top end which is a fair compromise)

I've been considering buying one of the PowerNow inserts from Scary Fast Racing to give the bike a bit more low and mid-range poke, I've read a bit about them and have seen no complaints, only good reports so something worth trying, much cheaper then a new exhaust.

http://www.scaryfastracing.net/

Not sure if you've seen this site before but a good resource for all things WR/YZ 250

http://www.thumperfaq.com/

Enjoy, DanJ

Thnx for yr input DanJ i will take it all into account. That site is really helpful... i didnt know it existed. I'd also like to make it sound a little more gruntier.... do you know of any mods for that? Much appreciated  ;D

Record a Harley, and play that through your Ipod!  Sound is unimportant, and is the primary source of aggravation for dirt bike bashers!

I ride a WRF 250, and can't imagine needing more power out of it.  Perhaps the next step is going to a 450?

Leave the bike as it it.  Enjoy it that way, and help the cause by not making it louder! (sorry if I sound grumpy!) 

What was that Serge ???
Sorry I can't hear you over my 450 !!!!!!

The easiest way to have a faster bike is to put a better rider on it.
Spend time working on you riding skills, don't spend money on making the bike faster. ;)

Most of the "real" info I have read about noisy exhausts is they "may" offer a little more top end. Now if you are a "gun expert racer" spending most of the day bouncing off the rev limiter you may get a few seconds off your special test times. For trail riding - save your money and spend it on a riding course plus that old saying is never more true "Less Sound More Ground"

[quote  (sorry if I sound grumpy!) 
[/quote]

Thats twice tonight you may have sounded grumpy Serge!

gotta second that ,practice,practice,practice it will go as fast as you can 8)

What year is it? If you have a pre 05 you are stuck with the goofy stainless steel pipe. I just picked up a o5 alloy stock pipe of ebay for $50 and put a TK Pipes insert in the tip. If you have a later model just buy the insert and off you go.  Yamaha also sell a GYT one. Stock pipe with the less restrictive tip works well. Most 250 4T riders that need more power really need to learn how to rev them more as they have plenty of power, its just getting used to riding them. If after all it still feels underpowered trade it in on a 450 or a 2 stroke 300. Cheaper than spending money on mods. If you want me to show you how to ride a 250 4T let me know ;D

Why, who are you going to get to demonstrate? :P

Can you show me please, i've struggled with small bores for a few years now.   :o

No problems, any time. Its all to do with right hand action.

I'll leave that one alone. Just too easy. :-*

You should.

Less sound = more ground