I am running the pro 40 enzo but they dont come with a duel rate spring. There is so much adjustment on em I am not sure its required. The center skid shock controls ski lift and once its set you dont have to mess with the adjustable limiter.
Its an exciter for sure. MP is right. The hood has a lip across the top. Could even narrow it down to a 1987 Exciter with the lip plus the hump in the middle and the red decal.