BOMBARDIER 1996 Ski-doo MX Z440 Handbook page 326

CENTER
For more ski pressure and more front end bite, use spring P/N 486066600 (180 lbs/inch, 7.5 inch
free length).
REAR
Adjust the spring preload to get about 1.5 inches of sag from full extension to normal ride height
with the driver on board.
Some drivers report positive results when adding additional strength to the tunnel. Remove the 2
rear plastic covers covering the rear bumper. Drive the steel rods located inside the tunnel rolls
forward until they contact the frame post. Tack-weld in place and lock these rods in place with at
least 3 rivets per side.
It is possible to further strengthen the rear suspension swingarms. Weld straps in key areas as per
attached sketch.
1. Weld 12 mm (1-1/2 in) long (2 locations)
2. Weld40 mm (1-1/2 in) long (4 locations)
3. Reinforcing strap
Traction
Most rules limit maximum stud height to 3/8 inch over the tallest part of the track. This equates
to an .875 inch stud with a backer plate on the 94-95 stock tracks. Always verify your stud
heights!
Use a thick profile, carbide tipped stud for most conditions. 3 picks per bar with stock 8 inch
carbide runners work well for terrain races while 4 picks per bar with square bar 10 inch carbide
runners work well on ice races. Sharper, thinner studs can be used on lake events.
Section 07 COMPETITION PREPARATION
2
07-15