YZ250F aftermarket exhaust, decisions?!

zcookie49

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#1
I want to add a new head pipe and muffler to my YZ250F and I have narrowed my choices to the Pro-cicuit T-4 and the FMF Powercore IV, (i cant find the White Bros E-seris cheap enuff). Believe it or not, I have got a quote for the Pro cicuit complete at $369 and the FMF at $330. Anyway, the Pro circuit has an optional spark arrestor for sale that fits on the end of this pipe for $25..It seems the FMF makes you chose the muffler and it has to be a spark arrestor muffler or strictly moto.. Has anyone purchased either one and has any feedback on any aftermarket pipes? They have been getting great reviews and I think having the ability to add a S/A when needed would be a nice feature.. Any comments are appreciated, thanks??

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#2
I wouldn't even consider either one of those soley because they are both WAY TOO @%#$%ING LOUD. I had a DSP which has the same muffler can as the FMF and I couldn't even stand to ride it. Nevermind annoying everyone else, I couldn't concentrate on riding with that roar in my ears. It is THAT bad.

I just ordered a Dr. D exhaust which is reportedly much quieter and seems to have unanimous(sp) praise from all the mags. The Dr. D comes with the spark arrestor which is easily removed.

I wouldn't run anything that is 104 or 105 db. even if it was free.......

That's my 6.7684 cents worth...

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osheen

BRC, AMA life member

'01 YZ250F, '79 KX250, '77 KD100m (first bike), '75 Road Toad, '74 Z50
 

will pattison

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#3
for whatever it's worth, i raced a yz250f in a texas cross country event this weekend. it has an fmf power core iv s.a. with stock header, and the bike absolutely ripped. the horsepower gain over stock is very noticable. this pipe, like all the fmf power core's for yz's that i have tried, seems to yield a mid-to-top kind of powerband.



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will pattison
engineer, racer
ignition
www.ignitioninc.com
 
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#4
You should check out www.teamthump.com

I have one of team thumps pipes and it makes a big difference. The bottom end is more like a 250 than a 125 now it revs more freely and the top end has a lot more for a lot longer. I road around for about a week and put the stock pipe on for a comparison and the stock pipe made it feel anemic. This is the only pipe that I know of that utilizes an insert in the header to give bottom end punch while maintaining the top end revability. I thought the power band was wide with the stock pipe. The Teamthump pipe makes it much wider.

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#5
osheen, PLEASE let us know how the dr. d performs and how quiet it is (how much louder than stock).

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#6
This month's Dirt Bike magazine did a 20 pipe
shootout for the YZ250F. You might want to
check it out.


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super rat

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#7
i rode my buddys 250f for the first time last week i was not all that impressed. i didnt feel like it pulled any harder than my 01 125. we just got back from riding this morning, he put the fmf power bomb(i think thats what he called it) on his and an sst on mine. the 250f rips its a big differnce in power over the stock pipe. his bike now smokes mine in the long up hills. yes it is loud but it is worth the power,imho.

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zcookie49

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#8
thanks for all the feedback.. yeah, i have the transworld mx issue and dirtbike with the pipe shootouts...i am under the impression that most pipes you can add or remove the spark arrestor, and that the FMF you cant, it is either spark arrestor or not.. I was under that impression that the spark arrestor may down play the power, and I have never had to use a s/a, but if I went to a park and they required it, it would be nice to have the ability to add it..

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#9
I have been doing an extensive comparison on the pipes and have narrowed it down to three pipes.

1. Dr. Dubach - as osheen has stated has great ratings from all the mags. It also has an optional s/a and a quiet insert. This pipe is 102 db without the quiet insert, haven't yet heard a reading with the quiet insert installed. Not sure how much these pipes are being discounted in price.

2. Pro Circuit - has good or excellent ratings from all the mags, has an optional s/a. Good all around power and good throttle response. As you have noted, you can get this one at a discount.

3. Yoshimura - has good or excellent ratings, excellent fit and finish, accepts the stock heat shield, and good all around power. Disadvantage - kind of pricey, no quiet insert that I'm aware of. 102 db noise level is one of the quieter aftermarket pipes without a quiet insert.

I think your decision boils down to if you want to favor low to mid power or mid to upper power. Also consider if you will need the ability to quickly install a s/a and/or a quiet insert. I personally have a need to install a quiet insert for riding at various places, but want the ability to remove it when I am racing on a closed course. I have also heard the FMF pipe and the DSP pipe and they are excessively loud. I would not buy them for that reason alone either.

I think I'm leaning toward the Dr. Dubach pipe myself. I would like to hear about the noise level and performance with the quiet insert installed.

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01 YZ250F
00 TTR-125L
00 TTR-90
00 PW-50
 
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#10
I read a test in dirt rider that said the stock exhaust is 100db. Is that unbaffled? I cant picture anything being louder!

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zcookie49

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#11
Hey Xchecker, thanks for the post of www.teamthump.com. Jeff has emailed me back with a price about $380, he too states that low and top ends significantly boosted, and the pipe is loud, (which doesnt bother me). Can you add a spark arrestor insert if needed to this pipe, I havent heard back from them yet, let me know if you can. Thanks!!!

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#12
McDermott,
I have the WR (w/o baffle)which tested at 99dB while idling. With a twist of the throttle it would easily push 114dB. Way loud!!!! I bought the Big Gun Race series pipe with the quiet core insert which brought it down to around 96dB when revved. The only problem I'm having now is jetting this thing. My powerband has been narrowed drastically and is all on top. The bottom still feels the same, the midrange is lazy, but when it get on top it gets scary fast(major difference) I'm still fooling with the jetting so maybe I can get my midrange back (thats where I ride the most!) So far, I don't like it nearly as much as my stock pipe w/ baffle removed, but I can pass the sound checks with this pipe.
Coop

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2001 WR250F
 

Rodzilla

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#13
and the pipe is loud, (which doesnt bother me).
[/B]
Well, not to be a pain but it's bothering EVERYONE ELSE thats the problem.

The greenies do nothing but gather support for their cause with every ear shattering bike out in the woods "disturbing the peace"

Personally, I'D like to ride until I'm old and grey.

Just something to think about



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Don't worry, it only seems kinky the first time..

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zcookie49

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#14
Thanks for all the replys... I decided to go with the pro-circuit T-4 with removable spark arrestor. I think the bike will probably be as loud as a 426 now. Hopefully the power pick up will be worth the money, I will update once installed.

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#15
thanks bcoop! It looks to me like the yoshimura might be the way to go. I dont want any more top because off road we rarely see screaming rpm's in the woods. The yosh pipe puts out 102db's according to dirt rider with a healthy jump in low and midrange, which is where we ride anyway!

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