Depends on the application. A dirt bike? Absolutely not; too much torque and horsepower means that you're going to spin your wheel regularly (and this is why most dirt bikes are thumpers, too). A conventional street bike, touring, or dual sport? You can probably go a little lower, but probably not a lot for a large touring bike like a Gold Wing. A sport bike? That's low, by at least 20bhp; 100-ish bhp is about the lowest you'll see for a 600cc-class sport bike. I can't say for certain what the tops competitive 1000cc supersport bikes are putting out, but it's probably close to 200bhp. And all of that power needs to be in a very light package, because you need the maneuverability to quickly negotiate s-curves. (I live in the mountains; there are a number of s-curves near where I live. I've seen the aftermath of cruisers crashing because they misjudged corner speeds.)