Clutch springs are a black art because (a) they come in different lengths, and (b) the color-codings are not universal. Good luck trying to get any useful facts from online vendors! You will make many mistakes until you get something useful. However, if you can find and install some STRONGER springs, your scoot will totally wind up higher before the clutch bites. This will surprise unsuspecting Tesla drivers when the light turns green! Since then I've decided that is much easier to buy a bigger scooter than to try to figure out clutch springs.