i am going to my first race on saturday and i am used to trail riding on my raptor 660 what should i expect how high are the jumps top speeds etc

 

it all varies..some jumps will be bigger than others..you should be able to view the track the day before you race, that might help.

 

This is what practice day is for, or maybe the practice before the race.
How big of jumps? This varys by jump but who cares, you shouldn't be jumping the first time out anyways. Same for speed.
Go race, learn, and have fun!!!
Plenty of time to worry about going fast.
If you keep the tires down and you see a checkered flag, you are a winner.
You do have a tether switch don't ya?