Drag Racing (Ice And Grass) - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

Section COMPETITION PREPARATION
07
DRAG RACING (ICE AND
Special Rules
Snow flap must be retained by chains or 1/8 inch diameter cable.
Double limiter straps are required by many organizations.
Front suspension
Lower the ride height as far as possible but maintain the legal travel requirement of two inches.
Shorter springs are available.
486066300 DSA front spring 125 lbs/in 8 inch free length
Trim the rubber blocks under the ski legs to reduce and adjust the amount of
heel pressure on the ski.
Use stock steel runners on the grass and stock trail carbide runners on the ice.
Center
Use fairly stiff springs and preload.
Shorter limiter straps will be required (486 0562 00 nylon). On grass, more
weight transfer can be used to keep the weight off the skis. On ice, run the
limiter very short to keep ski lift to a maximum of six inches.
Rear suspension
Lower the ride height to the two inch minimum.
Grass : Soften preload to help weight transfer and keep the skis from dragging.
Ice : Use a lot of preload to help keep the front end down for better top speed at the end of the
chute.
Add two pairs of additional idler wheels and replace the 135 mm diameter wheels with 141 mm
diameter wheels.
Shave the slider shoes down to a 3mm (1/8 inch) thickness.
Add a slide lube system if rules allow.
Traction
Most rules limit maximum stud height to 3/4 inch over the tallest pan of the track. Taller tunnel
protectors will be required.
Generally, fewer studs are required on grass than on ice. Also, less studs are needed on good,
thick sod or hard clay. More studs will be needed on loose grass, dirt and sand.
Grass : Four steel picks per bar (4 x 48 pitches on 121 inch track= 192 studs). Large horsepower
machines may need more studs. Exchange some picks for grass hooks on looser track surfaces.
Try some of the "chisel" style studs. They have a wider profile but are still sharp on the ends.
07-4
GRASS)