Polaris encapsolated roller secondary spring recommendations
I have a '99 Polaris 700 RMK that has been mod'ed to the hilt. It has Jet-Hot coated SLP pipes, Union Bay 9000' Head,
cylinder porting & polished, case ported, torque plate, torque arm, V-Force reeds, SLP boost bottle, 41mm carbs, and
and SLP airbox. Last year I ran a Hymark roller secondary (47.5 deg helix/yellow spring). This setup works awesome
but it turned out that this roller can't handle the abuse of grabbing the brake while flying through the air to level out the
sled during cornice jumping. It is also very easily damaged while changing belts. The roller should never be allowed to
'slap' shut or it will damage the bearings. Rapidly stopping the jackshaft while flying through the air (grabbing a handful
of brake) will damage the bearings also due the bearings leaving contact with the helix and slapping shut when one
sheave catches up with the other. This is very costly and Hymark will NOT stand behind their product. To solve this, I
purchased an encapsolated roller from Hi-Tech. ERs work in a different manner than traditional pre-loaded secondarys.
I am running a straight 48 deg helix for hillclimbing and have been playing with different spring rates. The manufacturer
has very little experience with steep angles and hillclimbers. Does anyone have experience with encapsolated rollers?
Any suggestions on spring rates? I need a spring capable of good belt pressure under high hp, soft enough for rapid
backshifting, and stiff enough to completely shift out at 100 mph and maintain RPMs. I have spring charts from
several manufacturers and so far I've tried the Pol-silver/blue, Pol-blue, Hymark-yellow. I just ordered SLP's new
purple/yellow to give it a try. What are the asphalt guys running in their ERs?