Mercury Snowmobiles Discussion Board

i though i read somewhere that someone said what they used to do back in the days is install certain thickness wachers to incres to spring tension and that was it. anyone know of something like this?

i have a 75 440 snow twister with cylinder mods, pipes and K&N's. i want to do my clutch now and hear you want 6000 enguage and 10000 redline, what spring and weights do i use without changing the whole clutch