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I think that a small bit of vibration at 5000 rpm that is happening to all the AT's is totally acceptable . We have to remember that a parallel twin with a 270 deg (or 90 ) is actually a difficult motor to balance .The balance shaft is trying to balance it out across the whole rev range and like all motors there is a small resonance / higher vibration somewhere in the rev range . The AT runs smoother and cleaner from lower RPM that my previous "orange twin " . Its something I can live with easily ... change up , load up the motor or ride in a gear that is beyond that rev range .
 
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