December 10, 2008

Getting Your Ride Right



Some ideas to smoothing out the bumps

The accompanying chart comes from the engineers and service people at Yamaha Motor Corp. and is full of suggestions and ideas on how to tune a suspension to get an optimal ride.

While the chart deals specifically with the FX Nytro, the theories presented can be applied to many other snowmobile models. None of the suggestions involve major mechanical work or changes so you can experiment to see what might work on your particular model

The key is to do a little at a time instead of making any major changes all at once. Change a little, ride, see how it feels and go from there.

Another good source of information is your particular sled’s owner’s manual as well as the your dealer or favorite aftermarket shop.

Tuning Charts & Suspension Settings
SymptomFront SkisCenter ShockRear ShockRear Limiter StrapFront Limiter StrapTrade-Off
Skis following ruts in trail 1) Reduce front preload or air pressure 2) Increase preload Understeering
Understeering 1) Increase front preload or air pressure 2) Reduce preload 3) Shorten Strap Skis following ruts in trails or heavy steering
Heavy steering 1) Reduce front preload or air pressure 2) Increase preload 3) Extend Strap Understeering
Oversteering 1) Reduce front preload or pressure 2) Increase preload 3) Extend strap Understeering
Front bottoming 1) Increase front preload or air pressure
2) Select stiffer spring
Too harsh over bumps, excessive ski lift, too stiff
Too harsh over small bumps 1) Reduce rebound
2) Reduce Compression
3) Reduce preload or air pressure
Too soft over bumps or loss of feel
Front bouncing over bumps 1) Increase compression
2) Increase dampening or air pressure
Too harsh over bumps, excessive ski lift, too stiff
Excessive inside ski lift during cornering or tippy 2) Reduce preload or air pressure
3) Adjust sway bar
1) Shorten limiter strap 3) Shorten strap Front bottoming or too soft
Rear suspension is bottoming out at feet (center) 1) Increase preload
2) Select stiffer spring
Too stiff, bounces over bumps
Rear suspension is bottoming out at rear end (rear) 1) Increase preload
2) Select stiffer spring
Too stiff, bounces over bumps
Rear suspension bouncing over bumps (center) 1) Increase rebound
2) Increase preload
Harsh over bumps
Rear suspension bouncing over bumps (rear) 1) Increase rebound
2) Increase preload
Harsh over bumps
Rear suspension too harsh over small bumps (center) 1) Reduce rebound
2) Reduce compression
3. Reduce preload
3) Lengthen limiter strap 4) Lengthen strap Bouncing, loss of feel
Rear suspension too harsh over small bumps (rear) 1) Reduce rebound
2. Reduce compression
3) Reduce preload
Bouncing, loss of feel
Track will not hook up/traction issue 2) Increase preload 2) Reduce preload Bottoming out or too soft







Kimpex
Bear Lake CVB


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