Is the chain guide in good condition? If there wasn't a chain guide I'd be worried about the edge of the tire catching the chain below the swing arm and potentially kicking the chain off the rear sprocket but with a chain guide that shouldn't be as much of a concern.
Do super-motos usually come with chain guides or is that a KTM thing?
When in doubt, gas it. It will either fix the problem, or at the very least end the suspense.
07 650GS / 05 DRZ400S / 72 CB350 (that hasn't run since shortly after I bought it)