T2 in a stock slightly modded 125?

holditwideee421
I got a 2020 YZ125 with a fresh top end. Just lookin for some race gas so why not. I have an FMF SST, V force reeds, Twin air power flow kit. Not much, but some “mods” I guess. Would the T2 give a bit more kick, and possibly run better? let me know. Not too familiar with race gas.
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bultokid
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bultokid 5/6/2021 8:15am
5/6/2021 8:15am
It'll do great. I run it in everything from a '74 Bultaco to '18 TC250 with no issues
holditwideee421 5/6/2021 8:20am
5/6/2021 8:20am
bultokid wrote:
It'll do great. I run it in everything from a '74 Bultaco to '18 TC250 with no issues
Have you noticed any kick in the fuel? Heard the oxidation gives a kick. True or not?
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FWYT
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FWYT 5/6/2021 8:42am
5/6/2021 8:42am
bultokid wrote:
It'll do great. I run it in everything from a '74 Bultaco to '18 TC250 with no issues
holditwideee421 wrote:
Have you noticed any kick in the fuel? Heard the oxidation gives a kick. True or not?
You really need to tune the bike according to the fuel to achieve an real gains.
Just running T2 in a fairly stock motor won't do much other than having less crap
in the fuel when compared to pump gas. With better fuel you can jet more on
the edge of crispy with a little more safety than pump.

If you just want a good bang for the buck, blend your T2 or mixed VP-110 or whatever,
with mixed pump. That's a decent cost/benefit.
Hammer 663s
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Hammer 663s 5/6/2021 8:43am
5/6/2021 8:43am Edited Date/Time 5/6/2021 8:44am
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but it will make sure you'll have access to all the motor can produce, assuming you ride it that way. Wink

We run T2 cut 50/50 with non-ethanol 92 @ 40:1 in our supermini to save a little $$. Running T2 alone can get spendy if you ride 2-3 times a week. Motor is a mild mod and it runs very very strong on that mix.

Hammer 663s
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TeamGreen
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TeamGreen 5/6/2021 9:29am
5/6/2021 9:29am
I run T2 in my RM125 & I cut down to 50:1 with VPs VPR.
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Skerby
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Skerby 5/6/2021 9:33am
5/6/2021 9:33am Edited Date/Time 5/6/2021 9:33am
Isn't T2 50:1??? I wouldn't go leaner than 32:1 unless I was riding singletrack.
*In a 125
1
holditwideee421 5/6/2021 9:37am
5/6/2021 9:37am
Skerby wrote:
Isn't T2 50:1??? I wouldn't go leaner than 32:1 unless I was riding singletrack.
*In a 125
T2 is pre mixed 40:1. That’s what I run
Bruce372
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Bruce372 5/6/2021 10:03am
5/6/2021 10:03am
Imo T2 is the easiest and most reliable fuel to run in any smoker stock or modded and don't over think the jetting.

Be careful with that SST pipe, they have a very narrow end section by design and back in the day ruined a lot of pistons.... didn't even know those pipes are still around. FMF used to make a rev pipe for 125s as well
holditwideee421 5/6/2021 10:14am
5/6/2021 10:14am
Bruce372 wrote:
Imo T2 is the easiest and most reliable fuel to run in any smoker stock or modded and don't over think the jetting. Be careful with...
Imo T2 is the easiest and most reliable fuel to run in any smoker stock or modded and don't over think the jetting.

Be careful with that SST pipe, they have a very narrow end section by design and back in the day ruined a lot of pistons.... didn't even know those pipes are still around. FMF used to make a rev pipe for 125s as well
Should I spend the money and get a different pipe?
2
Kennyfinpowers 5/6/2021 10:56am
5/6/2021 10:56am
Hammer 663s wrote:
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but...
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but it will make sure you'll have access to all the motor can produce, assuming you ride it that way. Wink

We run T2 cut 50/50 with non-ethanol 92 @ 40:1 in our supermini to save a little $$. Running T2 alone can get spendy if you ride 2-3 times a week. Motor is a mild mod and it runs very very strong on that mix.

Hammer 663s
Hammer what premix do you run? The rumor I’ve always heard is VP uses maxima. I cut mine 50/50 too.
CivBars
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CivBars 5/6/2021 11:29am
5/6/2021 11:29am
Hammer 663s wrote:
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but...
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but it will make sure you'll have access to all the motor can produce, assuming you ride it that way. Wink

We run T2 cut 50/50 with non-ethanol 92 @ 40:1 in our supermini to save a little $$. Running T2 alone can get spendy if you ride 2-3 times a week. Motor is a mild mod and it runs very very strong on that mix.

Hammer 663s
Kennyfinpowers wrote:
Hammer what premix do you run? The rumor I’ve always heard is VP uses maxima. I cut mine 50/50 too.
Hammer 663s
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Hammer 663s 5/6/2021 11:34am
5/6/2021 11:34am
Hammer 663s wrote:
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but...
It'll work fine - bike will run very crisp and clean. Hard to say you'll get any "kick" out of a 125 with just fuel, but it will make sure you'll have access to all the motor can produce, assuming you ride it that way. Wink

We run T2 cut 50/50 with non-ethanol 92 @ 40:1 in our supermini to save a little $$. Running T2 alone can get spendy if you ride 2-3 times a week. Motor is a mild mod and it runs very very strong on that mix.

Hammer 663s
Kennyfinpowers wrote:
Hammer what premix do you run? The rumor I’ve always heard is VP uses maxima. I cut mine 50/50 too.
Maxima Super-M. I heard the same rumor. Smile

Hammer 663s
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SLAPAHO
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SLAPAHO 5/6/2021 12:40pm
5/6/2021 12:40pm
i ran it in a new 2018 YZ125, Bill's pipe and silencer, otherwise bone stock. ran great, plus no ethanol. no gummed up carb is a huge plus.....you better get a good can to store it in tho. my garage smelled like a meth lab, even with it in their metal can... i had to store it outside... good stuff tho
Hammer 663s
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Hammer 663s 5/6/2021 12:46pm
5/6/2021 12:46pm
SLAPAHO wrote:
i ran it in a new 2018 YZ125, Bill's pipe and silencer, otherwise bone stock. ran great, plus no ethanol. no gummed up carb is a...
i ran it in a new 2018 YZ125, Bill's pipe and silencer, otherwise bone stock. ran great, plus no ethanol. no gummed up carb is a huge plus.....you better get a good can to store it in tho. my garage smelled like a meth lab, even with it in their metal can... i had to store it outside... good stuff tho
LOL - it sure does stink when you refuel but DAMN it smells good when it burns!

Hammer 663s
Bruce372
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Bruce372 5/6/2021 1:03pm
5/6/2021 1:03pm
Diluting down T2 is like pouring sprite in a 50 year old scotch.
2
theycallmeebryan 5/6/2021 1:06pm
5/6/2021 1:06pm
If you have a local airport close by, you might want to consider running AvGas 100LL. Its a very stable fuel, higher octane than most pumps, and much cheaper than race gas. You'll just need to lean your jetting out a little bit. I run it straight in my KX125 mixed 32:1 with Maxima Super-M and it works great.
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Tracktor
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Tracktor 5/6/2021 1:07pm
5/6/2021 1:07pm
Bruce372 wrote:
Imo T2 is the easiest and most reliable fuel to run in any smoker stock or modded and don't over think the jetting. Be careful with...
Imo T2 is the easiest and most reliable fuel to run in any smoker stock or modded and don't over think the jetting.

Be careful with that SST pipe, they have a very narrow end section by design and back in the day ruined a lot of pistons.... didn't even know those pipes are still around. FMF used to make a rev pipe for 125s as well
holditwideee421 wrote:
Should I spend the money and get a different pipe?
Spend money on a 38mm Keihin Airstryker carb of Ebay & put a STIC metering block in it and thank me later. Nothing comes close to what that will do for power & rideability, period.......
Black Diesel Bomber 5/6/2021 1:11pm
5/6/2021 1:11pm
holditwideee421 wrote:
I got a 2020 YZ125 with a fresh top end. Just lookin for some race gas so why not. I have an FMF SST, V force...
I got a 2020 YZ125 with a fresh top end. Just lookin for some race gas so why not. I have an FMF SST, V force reeds, Twin air power flow kit. Not much, but some “mods” I guess. Would the T2 give a bit more kick, and possibly run better? let me know. Not too familiar with race gas.
The only thing that will give the 125 more kick is your skills....keep it on the pipe. Momentum is everything with 125's and that's why they're the most fun and challenging to ride.

But yes, run T2.
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bd
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bd 5/6/2021 11:23pm
5/6/2021 11:23pm Edited Date/Time 5/7/2021 12:54pm
I'm running MRX02 in my RV Spec YZ125.

T2 is perfect for stock engines.
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dmm698
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dmm698 5/7/2021 8:30am
5/7/2021 8:30am
+2 main jet sizes in my yz250 going from straight c12 to T2 due to oxy content. TMR motor so requires race fuel, but the need for a fatter main due to the oxy content still applies to stock. Will be Lean going from pump to an oxy fuel.

Do those SST pipes still run way hot on yz125’s?

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