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External reservoir shocksExternal reservoir or "piggyback" shocks have dial-adjust knobs that control how fast oil moves through the shock's body. This controls compression and rebound and shock oil density plays a part here. Dial-adjust shocks aren't only in piggyback configurations, and some internal reservoir shocks have adjustment screws to control oil flow.
Generally, one-up sleds are built for the average rider (six feet tall and 185 pounds). For riders under a buck fifty-five or above 215 lbs., suspension performance is not ideal in the box-stock setup. Light riders often find the front and/or rear suspension stiff, experience minimal compression and find the ride less comfortable. They also may feel a "kick back" from the rear suspension.
Riders on the larger side may find that suspensions fully compress, giving a ride that's also less desirable. Bottoming out makes the spine, knees and shoulders absorb the full force of the impact. Heavier riders will want to increase the preload and decrease compression and rebound, while smaller riders will want to decrease the preload and increase compression and rebound.
Smaller displacement sleds have lightly sprung suspensions, but bigger cc machines are sprung heavily. If you're dissatisfied with your sled's stiff ride, loosen 'er up, or change out the springs for a softer ride.
Learning to dial in your suspension to match your weight, snow conditions and terrain will help you and your sled become one. If suspension adjustments don't make your sled handle correctly, there are other options to consider. New aftermarket skis, more aggressive carbides and other performance enhancements may be the ticket.