YZ 125 Cylinder on Gasgas EC 125

[gasso]

Hi Gasgas 125 riders, EC 125 2011-2013 is it anyone who has tried a YZ 125 cylinder on? Original or after market one?


/gasso

 

[webmaster]

Hi Gasgas 125 riders, EC 125 2011-2013 is it anyone who has tried a YZ 125 cylinder on? Original or after market one?


/gasso

I have heard internal parts crossover - like powervalves, etc. Piston might, etc.

I have never heard an entire cylinder could be used.

You would need to confirm things yourself. Even if someone says it "fits" - you just never know how well it does so....

jeff

 

[Elvis74]

I have a 125 YZ cylinder here and it fit, but the hight is different and you need another cylinder head and piston. The power valve cover is different as well, here you can use the one from the 2012-2014 gasgas models


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[Zman]

That is very interesting information. If I understand correctly, the cylinder head and the side covers are different? There are both flat top and domed pistons that can be used in the GG and YZ cylinders depending on the cylinder head.

I think there was an auto correct or translation error. What is different ("the night")?

 

[Elvis74]

The GasGas cylinder head is inside the cylinder and the YZ is flat just on top. I can take tomorrow some pictures but now it’s time to go to bed.


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[Zman]

So this could mean that he yz125 big bore kits will fit the GG?

 

[Elvis74]

I am not 100% sure, but this is the kit they mount on the 2012-2014 bikes


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[Zman]

Which kit?

 

[Elvis74]

From Athena

https://www.maciag-offroad.com/athena-cylinder-kit-yamaha-yz-125-97-04-sid19482.html

Here the pictures, left YZ and right GasGas
The YZ cylinder is about 92mm high and the GasGas 94mm

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[Zman]

Thank you for the detailed photos! Looks like the cylinder mounting studs are bigger on the YZ but we could use washers with flange head bolts.

 

[gasso]

Thank you very much Elvis for this pics and info, your YZ cylinder is it also 4JY marked? 1997-1998? But still up to 2004 they all fit on the YZ, so Gasgas use the head style as TM with the dome down in cylinder, and YZ as japs flat on. What year is your Gasgas cylinder?

I wonder if anyone know the difference between the Crankcase of Gasgas EC 125 year 2001 and year 2013, its hard to see with the eye but the part number is different.

 

[Elvis74]

I don’t know the production year of my spare cylinders, me bike is from 2011 and all cylinders Inhaber fit the crankcase.
About the new models, incant see a difference between my 2011 and the new 2012-2014 motors. In my opinion the motor is the same.

By the way, I never mounted the YZ cylinder until now, I just bought it because I got it cheap and for the 125 you cannot have enough spare parts. ;-)

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[Ilarion28]

I don’t know the production year of my spare cylinders, me bike is from 2011 and all cylinders Inhaber fit the crankcase.
About the new models, incant see a difference between my 2011 and the new 2012-2014 motors. In my opinion the motor is the same.

By the way, I never mounted the YZ cylinder until now, I just bought it because I got it cheap and for the 125 you cannot have enough spare parts. ;-)

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Hey Elvis.

Did you make the cylinder swap for the GasGas 125 with the YZ 125? How did it went, did you make big changes for it to fit?

I have been following this subject with great interest.

Thank you!