I just bought a 06 MXZ-X 440 race sled. Can any one tell me what clutch springs should i use to get the most out of the sled. I am currently maxing out at 65-70. I would like to get 75-80. Could I go up 2 teeth on the gearing to get that desired speed with out loosing all the bottem end or just stick with changing the primary and secondary clutch springs?