Yz125 pipe and silencer

AdamMX52
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AdamMX52
Edited Date/Time 6/13/2019 3:37pm
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 6/12/2019 10:38am
6/12/2019 10:38am
Probably would just change the power curve. Depends on what your definition of better is.
AdamMX52
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AdamMX52 6/12/2019 10:42am
6/12/2019 10:42am
yamaharider471 wrote:
Probably would just change the power curve. Depends on what your definition of better is.
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
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lostboy819 6/12/2019 2:12pm
6/12/2019 2:12pm Edited Date/Time 6/12/2019 2:13pm
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.
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AdamMX52
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AdamMX52 6/12/2019 3:48pm
6/12/2019 3:48pm
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
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b_kowalsk 6/12/2019 4:17pm
6/12/2019 4:17pm
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 6/12/2019 4:45pm
6/12/2019 4:45pm
lostboy819 wrote:
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...
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.
You are correct. On a two stroke you have to give to get. That SST should pull hard on top
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lostboy819
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lostboy819 6/12/2019 5:43pm
6/12/2019 5:43pm
AdamMX52 wrote:
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...
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
Bills pipes are also a quality pipe.
AdamMX52
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AdamMX52 6/13/2019 9:35am
6/13/2019 9:35am
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
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BR8ES 6/13/2019 9:39am
6/13/2019 9:39am
Sounds like you want a Bill's Pipe.
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AdamMX52
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AdamMX52 6/13/2019 9:45am
6/13/2019 9:45am
BR8ES wrote:
Sounds like you want a Bill's Pipe.
I do want one but I don't know if they're any good
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BR8ES
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BR8ES 6/13/2019 9:52am
6/13/2019 9:52am
BR8ES wrote:
Sounds like you want a Bill's Pipe.
AdamMX52 wrote:
I do want one but I don't know if they're any good
Sometimes you have to take a chance Adam and try a product. Bills usually puts out good stuff.
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Press516 6/13/2019 2:22pm
6/13/2019 2:22pm
Isn't the Scalvini a top end pipe as well?
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lostboy819
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lostboy819 6/13/2019 2:26pm
6/13/2019 2:26pm
Press516 wrote:
Isn't the Scalvini a top end pipe as well?
Yep that and the FMF SST are top end pipes but the Scalivini is way cooler looking. Cool Got to love the cone pipes.
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chump6784
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chump6784 6/13/2019 2:28pm
6/13/2019 2:28pm
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

AdamMX52
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AdamMX52 6/13/2019 3:08pm
6/13/2019 3:08pm
chump6784 wrote:
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...
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

Which line is which
pdub187
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pdub187 6/13/2019 3:37pm
6/13/2019 3:37pm
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
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lostboy819 6/13/2019 4:35pm
6/13/2019 4:35pm
pdub187 wrote:
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...
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.
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.
Derek Harris 6/13/2019 5:06pm
6/13/2019 5:06pm
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
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chump6784 6/13/2019 10:18pm
6/13/2019 10:18pm
chump6784 wrote:
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...
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

AdamMX52 wrote:
Which line is which
Red line hgs, blue line stock

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