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11/29/2017
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Sach157
12/16/2017 12:50am
12/16/2017 12:50am
Edited Date/Time
5/24/2019 6:05am
HI guys,
my current bike is a 2017 YZ 125 which I like a lot but after 25 hours of riding I came to the conclusion that it really lacks power. A friend of mine has a TM 125 and there is no comparison in terms of power especially on top.
I therefore consider buying the new GTYR kit which virtually includes a whole new motor.
Does anyone has long term experience with this kit in terms of relability / power gain ?
Is it worth the money (2499 euros here in Europe which is a LOT of money) or would it be smarter to directly switch on a recent 150/250 two stroke ?
How much increase in power can I expect ?
What about the 144 athena kit ?
All opinions appreciated :-)
my current bike is a 2017 YZ 125 which I like a lot but after 25 hours of riding I came to the conclusion that it really lacks power. A friend of mine has a TM 125 and there is no comparison in terms of power especially on top.
I therefore consider buying the new GTYR kit which virtually includes a whole new motor.
Does anyone has long term experience with this kit in terms of relability / power gain ?
Is it worth the money (2499 euros here in Europe which is a LOT of money) or would it be smarter to directly switch on a recent 150/250 two stroke ?
How much increase in power can I expect ?
What about the 144 athena kit ?
All opinions appreciated :-)
The comment above, to tune it, is good and indeed really add something. About the Athena, I didn't hear it brought top power at all, just bottom and a bit more mid, so it was not satisfying for someone relatively fast and could not be on par with a ktm/husky 150. About the Rinaldi, I didn't get the oppportunity to test it but I am a fan of the brand in general, so I did a quick search to help.
2500 euros is indeed steep, so on leboncoin maybe you will find something you like; especially if you already have some parts like a pipe and a Vforce, then just an ignition + a tuner (bottom/top/carb/set up) can make a great result (especially if you are ready to change pistons more often, below 20 hours):
https://www.leboncoin.fr/equipement_moto/1349203468.htm?ca=12_s
https://www.leboncoin.fr/equipement_moto/1354398924.htm?ca=12_s
https://www.leboncoin.fr/equipement_moto/1327827850.htm?ca=12_s
https://www.leboncoin.fr/equipement_moto/1354911434.htm?ca=12_s
https://www.leboncoin.fr/equipement_moto/1353483196.htm?ca=12_s
Enjoy !
Basically the same thing as this kit, It was more expensive i I can recall.
Cannot compare or say anything towards the others apart from seeing that kit again gave me a nice warm feeling..
Tuning would be an option but I'm not very confident in sending my motor all accross Europe.
In addition to that I don't know any good tuner where I live.
I read the 144 athena makes 2 HP more all accross the power curve which means it doesn't even come close to a last generation KTM 125... I'm curious to see what the 125 GYTR power output looks like.
The Shop
The GYTR is made for serious racer, the reliability is not the same as the stock YZ,
you'll have to change often the piston etc
The best way to upgrade the YZ is to put a good pipe (HGS; Messico ;Damon's pipe, Scalvini etc)
+ vforce 4
+ Rinaldi rotor
+ VHM Dome AE32100-B
My opinion is that You don't need the GYTR unless you're a pro (french junior class).
EHR tuning is also pricey!
Tuning the whole engine is for PRO too, as you'll need to change the parts all the time!
In case that you don't mind that point,
you can send your motor to many people like Bud Racing, SR, Reptil, Dragontek etc
The 144 athena kit is good but you have to tune it and to modify the crank case...
Engine failure can happen on any engine... how many hours of abuse on this GYTR cylinder?
I'm a little sceptic on the 250 2 stroke it might be too much considering the type of tracks I ride here in France.
Big bore is the least probable option I'll go for, I simply don't trust the quality of these kits.
So vforce reed cage + VHM dome the best option to go? Will the power increase be really noticeable ?
My best friend have a MJC race bike and I rode it, then I can tell you : YES the GYTR kit improves the power but NO (imo), it doesn't change that much the bike.
Moreover, after only a few hours (something like 5 to 8 hours, I don't know exactly), the piston broke. So he had to change the whole cylinder, piston, crank bearings, head, ...
So once again in my opinion, it doesn't worth the 2500€ they're asking for ! I was faster than him with a full stock YZ 125...
$450-500 USD is listed on Eric Gorr's website. Run race gas and let them build a rocket.
The Athena kit doesn't generally get very good reviews. Just putting the piston in makes it like a tractor, so if you're fast, you'll hate it since it won't feel like a 125 anymore. It won't rev out. That's why the displacement and motor mods need to go hand-in-hand if you keep it on the pipe.
http://www.hpracedevelopment.com/news
He says his mod 2 package has hit 45 hp on the dyno for some builds: it's $900.
I'd do this way before spending $2500 on a GYTR kit myself.
Pit Row
Doesn't matter if I'm riding tight indoor arenacross track to big wide open out door tracks the 250 is the weapon of choice.
For 2500 with us, you can get 6 125 cc legal
With the 134 or 144 you can get 6 with massive front side gains that will run as reliably as stock on pump gas.
The ktm and TM are both leaps better stock now days, and just bolt ons wont get you there...yamaha is finally long in the tooth.
If it were me I would build a 134 and have cylinder and head work done.
Good Luck!
You’d be asking for oem level work... which is better and more involved than most people ever appreciate.
It should run pretty good in addition to the fmf factory pipe and shorty silencer.
If it is not enough I will consider sending my cylinder for some mods!
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