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Sorry to thread dig, I bought a 2012 Super 8 2T about 2 weeks ago and it has been modified by the previous owner, only thing I can see is that it has a Technigas exhaust and it makes the same kind of noise yours does, its only does it above 60kmh and when taking off from a stand still and only when its warmed up.

Did you ever find out what it was?

Ive opened the case and have had a look inside but nothing seems out of the ordinary or broken, is it possible the belt is hitting the kickstarter pinion?