Helix not spring for me
I monkeyed around with this for an afternoon on my sled here at home on back to back runs in the same snow conditions, using everything I had that would fit out of the box of clutch parts. This was on my 2015 rmk LE 155 800.
stock springs with 10-68, from a dead stop to wide open, it would pull up to 8100 then drag down to 78-7900. Rolling start, or lifting off throttle. It would only climb to 76-7900.
Changed to 10-66 with stock springs.....better RPM across the board, but still had a hard time pulling back to 8000rpm if I lifted or was on or off the throttle.
Installed a Helix out of a 2012 800 136 switchback, that by the part numbers was slightly steeper (don't remember the numbers). Stayed with the stock springs again. Pulled noticeably harder in the midrange when on and off the throttle.
Then tried a stiffer finish rate secondary spring (don't remember#) but was like 25lbs more than the black. Now sled would not shift out fully=top speed down a bit.
Went back to stock springs, and moved to a Erlandson custom helix. No numbers on it, as they don't want a guy to know what it is so he can tell his buddies. I can only say from the eye test was steeper yet than the switchback helix. Runs straight up to 8250-8300, and pulls hard. Lift and goes straight back to 8250 when back to the throttle. Top speed is 75-85mph on a trail, and no black streaks on the clutches. Belt is never hot to the touch.
I wish I could tell you the numbers for the Erlandson helix, as team is selling over stock helixs cheap on their site. I do know the helix was out of like an 06 IQ 600 clutch kit.