Others have more experience with Gasgas and can probably give you better feedback. And i know ive seen pictures of what im going to describe. But my 07 ec300 ISDE bike has never squeeled. When I opened up the motor for other reasons, I see the "webbing" between the fingers of the clutch basket has been machined away. I abuse this bike and if the basket was going to break because of this it would have by now. Where the fingers of the basket attach to the back of the basket you will see raised material between the fingers, on my bike this is gone and I have no problems. This allows oil to get to the bottom plates better. Worth looking at, as this was likely done by the ISDE team when the bike was new.
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