The best advice i can give is buy a skidoo race manual. There are all kinds of good details about each individual clutch part and its purpose. when I started i knew nothing about clutching and after reading my manual about ten times or more I feel pretty comfortable tuning my clutchs, though i still refer back to it quite frequently. It is well woth the money. My $.02, ANDY
Let the snow be deep
the trails be wide and
the hills be steep
Ramps- they determine the shift force or shift speed at their point of roller contact. Taller=slower at the high end, or higher engagement at the low end.
Pin wt.- provides centrifugal force to the moveable half and is balanced by the spring and ramp angle.
Drive spring- provides engagement and full shift "balance" to the drive pulley. Balance being a fine adjustment to pin wt. and top RPM. Adusters- the adjusters can be used to achieve the desired RPM as conditions change. They raise ad lower the high end of the ramp. Note that although RPM changes (up or down), shift speed also changes. As an example...if at position 3 the pulleys are at a given ratio by a certain speed, that ratio will be lower in position 5, and higher in position 2
Driven spring- sets the tension of the driven to the cam and assists in backshift. Can also provide "balance" to the system, but not to be used to achieve RPM.
Driven cam (helix)- sets the torque reactive or torque sensing nature of the driven. Large cam angles (higher numbers) shift out faster but backshift slower, and also lower the peak RPM of the CVT opertion. Lower angles would be opposite in nature. As stated in the manual, higher angles are like a course thread on a screw, lower like a fine thread.
This is a general overview of the TRA. Your sled is a high TQ, lower RPM machine. You`d like to see about 78-7900 on the tach. Stock is always a great place to start. Make your changes 1 AT A TIME. I`d play with the adjusters 1st. Chaincase gearing has effects too. Monitor pulley temps to get a feel for efficiency. I think that one responds well to a multi angle cam for ultimate trail manners.