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AdamMX52 AdamMX52
6/12/2019 10:33 AM

Right now I have a fmf sst pipe and it made the power super smooth, before we had a fmf fatty I'm thinking about going to a bills pipe does anyone know if they're any better.

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yamaharider471 yamaharider471
6/12/2019 10:38 AM

Probably would just change the power curve. Depends on what your definition of better is.

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AdamMX52 AdamMX52
6/12/2019 10:42 AM
yamaharider471 wrote:

Probably would just change ...more

Well the pipe I have right now made it smooth but didn't add any power if anything I might of lost power, but we do have the top end ported

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lostboy819 lostboy819
6/12/2019 2:12 PM

the FMF SST is a top end race pipe the fatty is more of a low to mid pipe. What year YZ125 is it. You probably did lose power down low with the SST but gained it up top as they are made for the fast 125 rider. Two different pipes for different types of power delivery.

Ed Johnson

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AdamMX52 AdamMX52
6/12/2019 3:48 PM

Ok, well I feel like I'm a fast 125 rider considering I'm winning 250 b on it but anyways do u know much about bills pips because that's what I'm think we'll buy next

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b_kowalsk b_kowalsk
6/12/2019 4:17 PM

Don't think they even make the SST anymore. Had one on my yz125 and loved it. Over rev was amazing

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eric513anderson eric513anderson
6/12/2019 4:45 PM
lostboy819 wrote:

the FMF SST is a top end ...more

You are correct. On a two stroke you have to give to get. That SST should pull hard on top

2011 Yamaha YZ 250 -MX
1996 Yamaha Banshee 350 -Trails
1982 Chevy S10
2005 Pontiac GTO -451rwhp

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lostboy819 lostboy819
6/12/2019 5:43 PM
AdamMX52 wrote:

Ok, well I feel like I'm a ...more

Bills pipes are also a quality pipe.

Ed Johnson

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AdamMX52 AdamMX52
6/13/2019 9:35 AM

Ok, well I feel like I'm a fast 125 rider considering I'm winning 250 b on it but anyways do u know much about bills pips because that's what I'm think we'll buy next

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BR8ES BR8ES
6/13/2019 9:39 AM

Sounds like you want a Bill's Pipe.

vomiting equals disqualification.

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AdamMX52 AdamMX52
6/13/2019 9:45 AM
BR8ES wrote:

Sounds like you want a ...more

I do want one but I don't know if they're any good

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BR8ES BR8ES
6/13/2019 9:52 AM
BR8ES wrote:

Sounds like you want a ...more

AdamMX52 wrote:

I do want one but I don't ...more

Sometimes you have to take a chance Adam and try a product. Bills usually puts out good stuff.

vomiting equals disqualification.

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Press516 Press516
6/13/2019 2:22 PM

Isn't the Scalvini a top end pipe as well?

'75-'83 through the minicycle boom.
------------------------------------------------------------------------------------------------------
I was fast... But being fast is relative to who else is on the track with you.

ZachO fan! ZO16

TG243 fan!

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lostboy819 lostboy819
6/13/2019 2:26 PM
Press516 wrote:

Isn't the Scalvini a top ...more

Yep that and the FMF SST are top end pipes but the Scalivini is way cooler looking. cool Got to love the cone pipes.

Ed Johnson

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chump6784 chump6784
6/13/2019 2:28 PM

Here is a dyno graph of the hgs pipe for the yz125. One of the posters on here contacted Bills a little while ago and they told him they use hgs as their bench mark

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AdamMX52 AdamMX52
6/13/2019 3:08 PM
chump6784 wrote:

Here is a dyno graph of ...more

Which line is which

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pdub187 pdub187
6/13/2019 3:37 PM

HGS and Dep make excellent YZ125 pipes. The FMF sold by GYTR is wicked too. You just need to get the jetting right or else you're going to get some serious heat.

A stock Yamaha pipe is better than a PC pipe.

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lostboy819 lostboy819
6/13/2019 4:35 PM
pdub187 wrote:

HGS and Dep make excellent ...more

Depends on the year,not sure what year the OPs YZ is but if he has a SST FMF not sure when they quit making them. Some years the pro circuit worked pretty good but not on the newer years of YZ 125.

Ed Johnson

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Derek Harris Derek Harris
6/13/2019 5:06 PM

If the bike is stock I found similar results as the posted bills chart with a bills


Once you modify the bike - if it's actually modified - I found the fmf/hgs to be a little better mid range and the bills to be a little better past peak

Against all 3 the OEM pipe when brand new isn't bad by any stretch...it has the best torque feeling on the track but little weak up top


The PC is ok on a stocker - adds some RPM.

On a mod I've not found it to be my first choice. If the sold villo's version with the longer belly - it would probably mate well to a mod.

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chump6784 chump6784
6/13/2019 10:18 PM
chump6784 wrote:

Here is a dyno graph of ...more

AdamMX52 wrote:

Which line is which

Red line hgs, blue line stock

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