Gas gas ec 125 keeps blowing head gaskets?

[Kuosmane]

My gas gas ec 125 has blown about 3 head gaskets. I have had 2 cylinders and 2 heads , and it has blown the gasket with both. Gasket surfaces are straight and this has happened after full engine rebuild . What could be the problem?

 

[Davehuge]

Can you confirm if you're you tightening both the barrel/cylinder and the head down evenly and down to the specified torque?

You said it's blowing gaskets? As far as I'm aware the cylinder head has 2 'O' rings in it. Do you mean it's blowing one of the 'O' rings? If so, which one?

 

[450exc115]

Are you setting the number of base gaskets to ensure the transfer port line up with or are above the piston at TDC? After that you need to check he squish on the head to make sure it is in spec.

 

[Elvis74]

Which squish do you have?


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[Kuosmane]

Problem solved

My ignition was too advanced. After i set it to 1mm btdc it stopped blowing inner headgasket

 

[Davehuge]

Great to hear you found the problem and thanks for letting us know.