First off, I would run more oil. With more oil the rings seal better and tend to last longer. I run about 40:1.
Second, check the float level and tune the jetting. I am not familiar with what JD jetting provides for GasGas. At full throttle, you are primarily on the main jet. It sounds like you may be too rich. You may want to try stepping down the main jet size.
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Eric K
'06 GasGas EC300
'01 GasGas XC300
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