G'day Max. Sounds like your prettywell on the money mate. From the info I've been able to muster, 28hp @ 11,000rpm. Then I read somewhere else, it's maximum revs were 10,000. So yeah, meet them half way and Bob's yer uncle, so to speak.
The GV 650's are a pretty slick looking bike hey. The Koreans are putting out a damn good quality product these days ! They're starting to kick arse with their cars too. My work car is an i30 wagon, and I've been more than impressed with it. They're starting to give the whole bike and car industry a big wake up call that's for sure, in the quality and value you get for your money.
I still dig my little pony though.
Anyhow, take care and ride safe amigo.
Best regards,
Hairy Bob.