Yes, sounds are hard to describe. it does change to a loud sharp crackle like a motor cross muffler. my concern is that it stays that way for a couple of minutes even after pulling up and just fettling the throttle.
the power valve was shimmed when the jetting was done. mechanic said it had a lot of play. But on reading on this and the Ausie forum most 08's seem to have the play.
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