Originally Posted by GenReaper

Had the same problem with mine mate.

To fix this pull the retaining screw out, then the two halfs of the locking bolt that clamps the carbi in the crankcase then grab an angle grinder and shave a small amount off the midle of both of the pinch bolts, dont bother trying to do it with a file as it is hardened steel and you will be there for a year, or use a pedestal bench grinder just be carefull, and i promise you this will fix your problem, just dont forget to seal the pinch bolts after and lock tight the retaining bolt when you line the carbi back up.