Yeah, I'm in the South-western ontario area.
There is usually only 2 classes, Junior and Pro. You will have no problem starting in Junior, that's where all the beginners start. There are someimtes a Blaster or the like, but mostly 400EXs, LTZ400, predetors, 250R, Raptors, a real mix of bikes. Some are stock, most have exhaust, tires and a few things. A Kill switch is regulation, and I HIGHLY recommend nerf bars, you're suicidal to race without them!
You should just give it a try, and just TRY TO HAVE FUN! When you are starting out, the important thing is just to learn something from every race.
I had a KFX400 last year, I only got out to 3 races, but I had a blast. I did well at the Paisley RAT track, but RJ motorsport overwhelmed my stock suspension quickly (that's where I cracked my frame!
) I'm really looking forward to racing the 450R this year, I'm going to try to make it to a couple of races per month, starting in June. If you see another 450R racer, come say Hi, might just be me. My number is 76.
-RR