it depends on if you have it licensed and have insurance on it.
No, the Benelli 1130 comes in either a sportsbike version - Tornado 1130, or a street/naked bike version the TNT 1130.
about 70mph
Yes it can be registered, if you have a title for it is even better. I have one that is street legal. The CR125 was the motorcross version of the same bike.
150f is the trail bike where 150r is the motorcross. Trail bike is a good solid bike, as long as you use it for what it's intended, trails. I'm sure it can do some motorocross stuff. If your looking to get into motorcross though, the 150r is better suited.
honda is a better motorcross bike (250 and 450) and yamaha is a better trail bike
maybe 60mph
You do not have to 'get it' or 'sign up' for motorcross. This is something you do on your own, you just train on your own, and of course you have to have a bike and gear, but you just go to the race and register. That's about it. lol
about 50-55 mph
buy a bike some gear and check online for local tracks
After defeating Leon, you take what you want to combine to the dirt bike in his trailor and combine it there.
65% - 75%
The Kawasaki KX250 is a motorcross bike which was introduced 39 years ago in 1974. It has been ridden to various AMA Motorcross wins and won a number of titles.