2011 ec125 Six Days compression?

[rosco]

So I ordered a Wossner piston kit for it last week. Went to put it in today and noticed quite a bit of difference in the two pistons. The stock piston[I hope its stock] has a flat top and no window on the intake side. The wossner has a slight dome to it and has a window on the intake side. SO now I am dealing with a clearance issue between the top of the piston and the head.
So has anyone ran a wossner on their 125 and if so did you run into this same problem? Also I see this thing has a Vesrah rod on it. I didn't think anything came stock with a Vesrah rod.

[Elvis74]

The piston with the done is for the older models, the current one have a flat top!


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[barossi73]

Does the old piston have any markings on the crown that could identify it?

[Elvis74]

This is how the current piston looks like




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[rosco]

Thanks guys! I'll have to order in another piston. It appears that it has the stock piston in it but you can see where it got scored on the ex. bridge. I'm guessing that was some of the reason for the low compression reading. So are you guys running about a 1.2mm squish clearance on the 125? Hopefully I will have something figured out on the running by the end of the week. I have a buyer that has been very patient on me to get this thing running right.

[rosco]

So are you guys using the stock GasGas piston as a replacement or have you found another option?

[rosco]

Also curious if the Vesrah rod is stock or if someone has put a rod kit in it.

[Elvis74]

I run woessner pistons in mine.
In the 125 I run the stock rod, in my 144 I have a wisco rod from Yamaha YZ with a Yamaha YZ piston.
Stock parts are ok for a not tuned motor.


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