Hello, I'm new here, but have lots of MC experience.
Have been helping a friend by his first bike. Never swung a leg over an MC before, but has high speed bicycle experience and is mature enough to not get silly on it.
I highly suggested he look at the Ninja250. Same reasons as above, buy cheap, learn the basics, gain confidence without being scared of a big engine, then sell at minimal loss after a few months or year. Expect to drop it at least once (especially a short rider). Or even the Ninja500 would be doable. Other people told him to go bigger and get a 600.
Also suggested he first ride the training class bike to baseline what 250 or 500cc's feels like, then decide from there.
But, he really, really wanted the FZ6 and thought he could pick up riding quickly. So we looked at a used one in great shape last night. I test road it in the rain. My thoughts were not enough power to get in trouble IF and ONLY IF the rider can swallow their ego and not be silly on it. In other words, take it slow and easy. He's mature, and I think hte engine power will be not overwhelming if kept in the low rpms. However, I may intentionally slow the bike down (exhaust and intake restrictions) for him while he learns.
But the clutch really is touchy! The engagement zone is fairly small, easy to stall. I intentionally tried to be lame on the throttle a few times during starts and it stalled every time.
So I advised only buy the bike if he thinks he can master a sensitive clutch. He thought he could, but I'm little nervous as he's never used a clutch before.
Well, he bought it last night and rode it home for him!!!
So I'm going to offer that he drive my 5 speed sports car to learn the clutch (never used one, ever) before his class. The clutch on this car is fairly easy to use, but it's also quick/high revving/powerful like the FZ6 (MR2 Turbo, modified). Then he'll take a riding class and will start out in parking lots once he gets his license.
With training, maturity, and concentration on the clutch/throttle, it should not be a problem to learn on this bike. Key word here is maturity, if he was my neighbors' 17 year old this may be a bad first bike. I think he'll be fine on it, but he has the maturity to start slow and be safe.