The purple is a max rpm spring and can range from 1000 to 2000. CVT's are all about test and tune. No 2 quads run the same with the identical setup so there is no common answer. You need a few differant size of rollers, mark your variator and then test each size. Since i still dont know what spring u have I would suggest calling hetrick or maximum rpm and get there suggestions for a starting point. cvt's can be a real pain and take alot of work and patients to get the most out of them. Also the spring should be stamped with a number
