Ken,
Welcome to the wonderful world of karting in Colorado!! I am sure that since you joined this forum a year ago, and have been reading it since… you can see what you are getting into!! Really, I think you will love it, and will find your fellow karters friendly and helpful.
Anyway, on to your questions. I suggest contacting Bill Noud of Rocky Mountain Kartworks. He and his son AJ were part of McGrath Motorsports, and now Bill has his own thing going. He is a dealer for GP and Sonik. His number is 970-218-5724. Tell him I said to call! Also, I am sure that everyone will respond with answers to your other questions, but ask Bill those questions, too.
good luck
Angie
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