We see new riders all the time. Being a manufacturer specific forum where the manufacturer didn't begin offering less than 600cc bikes in the US until recently, we don't tell new riders they can't do it. We don't tell them "find a smaller bike". Confidence in one's ability is needed when starting to ride on a sport bike. Not crap that may scare them off a bike. And yall go way over the top on the 600 sport bike's capabilities.
Confidence in abilities they don't have, is why so many drunk 17-25 year old males get to demonstrate interesting and creative traumas to emts.
What beginners need is a fail safe environment. Some place where there their misplaced confidence has minimal consequences.
the best way to do this for beginners on motorcycles is:
1. Gear, this is literally a fail safe- as in when their abilities fail, it will help keep them safe.
2. a forgiving bike, this is what a beginner bike provides, and a 600cc SS does not.
3. realistic assessment of abilities. This means not telling them what they want to hear, to boost their confidence in abilities they don't have. Instead tell them what they can expect their abilities to be.
Case 1: no prior experience or minimal experience.
what they can expect their abilities to be.
capable of learning.
If they take an MSF course they should have the basics enough to be safe on the street with a beginners bike. They can use this bike to learn what kind of riding they like, what they can do, and how to stretch and improve their abilities.
Case 2: Dirt bike experience.
what they can expect their abilities to be.
Know where the controls are, and the basics of keeping the rubber side down. However much of how you ride a street bike is different from how you ride a dirt bike.
And they will not be familiar with surviving on the street, they won't have street skills yet.
This means that they can do well with one of the 650 standards, or other non aggressive bikes.
Case 3: Cruiser, touring experience.
what they can expect their abilities to be.
Know where the controls are, and the basics of keeping the rubber side down. plus knowing street survival skills.
They have the ability to start on what bike they want.
But if they want to get "good" at riding a sport-bike, that is riding the sportbike as what it was designed to be ridden, they will have a lot of learning to do.