Relax, you won't flip it. Or rather, it's so unlikely when riding normally that it's not worth worrying about. The front may lift on the power, especially if you wind it on hard over a crest, but your self-preservation instincts will probably make you roll off well before you ride through 90 degree.

Of course, if you're trying to wheelie, rough and overeager throttle abuse once you've hoisted the front wheel might well dump you off the back, though even that's pretty hard work. Just as when riding normally, your survival instincts will probably have you rolling off before you flip the bike.

What you might want to worry about is your landing. You could get into real trouble if the bars turn while the front wheel is off the floor, or if you chop the power off so the front end drops hard. The front end will shimmy and if you're going fast, or if you have a white-knuckle grip on the bars, that could be you off.

When the front comes up, keep a light grip on the controls and ease off the throttle: it takes just a slight reduction in throttle opening to let the wheel return gently to the ground. And not forget to try to keep the front wheel straight.

As you come from a much lighter motorcycle, I would suggest that you first get comfortable with the weight difference and handling of this bigger machine.

Even with the wheelie inhibitor it is still possible to get the Yamaha’s front wheel of the floor.

The best lesson is to take it easy for the first few months (depending how much time you spend with your bike). Best you do some training on stopping and accelerating to discover your limits. And with more and more training you will see that you will have much more control over the bike…

Sounds like you'd be better off with the CBR 150...