I have a stock SP and it is as good as it gets.
go to www.fastrackrider.com or call them and mention my name and they will treat you well.
you should be fine with a stock NSR....just start from the novice class.
Dana at fastrack will take care of you when you call.
Calnifornia Speedway at Fontana and Willow Spring are places my teammate and I usually go.
How long have you been riding??????
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90 NSR SP