Best pipe/silencer combo for 2015 YZ-250

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12/1/2015 9:10 PM

I have been seeing alot of people using the stock pipe and shorty silencer combo on there yz's,anybody here have any input on this?I've got a FMF Gnarly and FMF shorty on it now and it works really good but is pretty abrupt and would like to take it down some w/o killing it completly.What are your opinions on this setup?
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12/1/2015 9:26 PM

Craig, I've already told you....
Get a DEP and a PC 304 (non-shorty) and live happily ever after. Or run the stock pipe with the FMF shorty. The gnarly with the shorty is all bottom end bark. It will hit real hard down low, but not rev out.

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12/1/2015 9:39 PM

I know what you told me Scott,and I'm going to put the stock pipe on it with the shorty for this weekend and see what happens....
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12/2/2015 5:06 AM

Just giving you shit Craig. See you this weekend.

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12/2/2015 12:05 PM

I run the a PC works pipe with the 304 "longy" silencer. I think the bike builds power pretty smooth, still barks in the middle though.

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12/2/2015 1:09 PM

I'm running the fatty and stock "US spec" shorter silencer. Power is smooth, doesn't feel lacking anywhere.

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12/2/2015 1:50 PM

I'll also say that the stock pipe and old US spec silencer was an awesome combo as well. This shit is so subjective.

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12/2/2015 7:18 PM

Stock

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"Nothing happens until something moves"

12/2/2015 8:05 PM

mb wrote:

I'm running the fatty and stock "US spec" shorter silencer. Power is smooth, doesn't feel lacking anywhere.

I "think" the US Spec silencer is pretty much the same spec as the FMF long silencer. Core size/length.

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12/2/2015 10:28 PM

Put the stock pipe back on and i am going to try it with the shorty this weekend and see what happens....
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12/3/2015 5:53 PM

Rideredmx2 wrote: Put the stock pipe back on and i am going to try it with the shorty this weekend and see what happens....

stock with shorty

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[Moto D Racing

12/3/2015 10:13 PM
Edited Date/Time: 12/3/2015 10:19 PM

i bought my bike with a pro circuit platinum pipe, and shorty 304 (R304) it's the only pipe i have had. its the only dirt bike I have really rode, for more than an hour anyway. I think a lot of people don't think about the weight of the person riding the bike. I'm only 140lbs, and my bike has a ton of bottom end but very predictable IMO.... now someone 250lbs might think it sucks on the bottom end and the fatty pipe is better. but yea no complaints with my power. if you have the stock pipe try it, but it is proven the pro circuit pipe makes more power, which is what i want.

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12/4/2015 10:06 AM

I used to have yz250s I used the FMF Fatty with the power core 2 silencer, not sure if they still do the silencer,
The bike ran great, smoother of the bottom & more meaty all the way if you know what I mean, can't spell torquier.
I used to lean the main jet & the pilot, they ran realy clean & crisp.

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12/4/2015 11:34 AM

I used to run my 04 with the stock pipe with a pipe spacer, and an R304 silencer. Loved it.

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12/4/2015 11:44 AM

Markopolo400 wrote:

I used to run my 04 with the stock pipe with a pipe spacer, and an R304 silencer. Loved it.

If I recall correctly, the pipe changed in '06 to effectively create the spacer you used on your 04.

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12/4/2015 12:27 PM

mb wrote:

I'm running the fatty and stock "US spec" shorter silencer. Power is smooth, doesn't feel lacking anywhere.

HackMan162 wrote:

I "think" the US Spec silencer is pretty much the same spec as the FMF long silencer. Core size/length.

Anyone have a powercore2 they want to measure? This would be some good info to have.

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12/4/2015 2:14 PM

You might like a flywheel weight. If you are willing to sacrifice a little bit of top RPM, a flyweight will do exactly what you're looking for with the combo you already have on. You could also try dropping the rear sprocket 1 or 2 teeth.

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12/5/2015 5:58 PM
Edited Date/Time: 12/5/2015 5:58 PM

OK I tryed the stock pipe with the FMF shorty today and that is what I will be running,it smoothed it out some and gave it a tad more rev.Now to pull it back off and strip the paint off and blue the welds like a PC or FMF.....thanks for the input everyone
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12/6/2015 8:09 AM

I personally really like the fmf sst with a pro circuit 304 long silencer. I've tried a bunch of different combinations and for whatever reason liked it the best, so that's where I settled

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RPM Performance
CT
783

12/6/2015 5:35 PM

I am running a bills pipe and stock silencer I shortened about 2". I really like the power delivery and over rev of the combo. I have done stock, PC, FMF, and DEP. the bills seems to be real good

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12/8/2015 5:37 PM

ehr400 wrote:

I am running a bills pipe and stock silencer I shortened about 2". I really like the power delivery and over rev of the combo. ...more

Hi guys long time lurker first time poster here. Just wondering how the power delivery is on the Bills pipe? I plan to run the stocker for now as it's very good. I know DEP is good from what I've read just haven't heard much on the bills pipe for yz250s. I've had good luck running their pipes on other bikes so just wondering

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12/9/2015 4:26 AM

From what Derek Harris has told me is the the DEP makes the most on the dyno, but seems not to transfer to the track very well, sorta a dyno queen.

I like the Bills personally over the PC because it has a smoother midrange transition and better over rev.

Photo

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12/9/2015 1:59 PM

ehr400 wrote:

From what Derek Harris has told me is the the DEP makes the most on the dyno, but seems not to transfer to the track very ...more

Thanks for the info! I saw you have porting done. Did you try the bills pipe on just your ported engine or stock as well?

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12/10/2015 3:29 AM

it is on my ported motor. REally dig it. DErek harris hasnt ran any dyno numbers on this combo but it feeels alot better then the PC combo previously.

I also can only run 1 degree of advancment of timing with this setup vs, 3 degrees I ran with the PC setup. FYI full race gas motor also.

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12/11/2015 6:16 PM
Edited Date/Time: 12/11/2015 6:17 PM

ehr400 wrote:

it is on my ported motor. REally dig it. DErek harris hasnt ran any dyno numbers on this combo but it feeels alot better then ...more

Good to hear thanks for the info! Curious how the bills pipe would work on a mostly stock bike with the squish corrected and head cut for 100 octane...as this is my plan for the bike at the moment

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12/13/2015 4:04 AM

Kenny Boy wrote:

i bought my bike with a pro circuit platinum pipe, and shorty 304 (R304) it's the only pipe i have had. its the only dirt bike ...more

It's the only dirt bike you've ridden and never grid the stock exhaust. Yet you recommend the PC over the stock exhaust.. Since you only care about power I assume you are drag racing your Yz250?

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12/15/2015 5:18 AM

ehr400 wrote:

it is on my ported motor. REally dig it. DErek harris hasnt ran any dyno numbers on this combo but it feeels alot better then ...more

hausyz855 wrote:

Good to hear thanks for the info! Curious how the bills pipe would work on a mostly stock bike with the squish corrected and ...more

Yeah like I said I have no problem running race fuel. I run U4.4 and have had great results. I ran LL100 fuel and it ran good as well, just not quite as well as the VP. I am gonna try some Renegade also.

I really like the fit and finish of the Bills pipe also. Fit like a glove. Don't get me wrong the PC is good bit fitment was quite a bit off. Just a observation.

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12/15/2015 5:19 AM

Kenny Boy wrote:

i bought my bike with a pro circuit platinum pipe, and shorty 304 (R304) it's the only pipe i have had. its the only dirt bike ...more

MaxPower wrote:

It's the only dirt bike you've ridden and never grid the stock exhaust. Yet you recommend the PC over the stock exhaust.. ...more

Lol I thought the same thing. I like the stock pipe but it gives up on the over rev side compared to the Bills or PC IMO. The transition is smoother with stock vs. PC but the Bills is very close to stock delivery with the over rev.

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