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Gino, i haven't ridden with you but i would suggest 11, 14, 18. those are all novice classes but plenty of competition. amateur stuff will be faster. keep in mind that in MX, you do practice + two motos per class. five sessions if you enter two classes. most novice classes are 4 or 5 laps.
Joel, sweet that you're riding this year yes, your YZ is allowed in both of those classes.