Rear Axle Modification - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

Section 03
CHASSIS PREPARATION

Rear Axle Modification

Heavily studded tracks combined with hard cornering put enormous loads on the track. To reduce
the chance of derailing the track and to help spread the tensile loads of the track, a fourth idler
wheel should be installed.
Modify your rear axle and fabricate sleeves as necessary for your Formula model year to allow the
mounting of additional inner idler wheels. The two inner idlers should be placed so that they run
between the left and right double rows of drive lugs. This will help maintain alignment of the track
and lessen the chance of derailing.
Use the spacing shown in the drawing noting that the outer two idler wheels are in their original
position.
, AOIFIHS
1. 101.5 mm (3-63/64 in)
2. 123 mm (4-27/32 in)
3. 101.5 mm (3-63/64 in)
4. 326 mm (12.83 in)
When you have reinstalled the track and suspension, make certain that all bolts attaching the
suspension to the chassis are installed with high strength threadlocker (Loctite 271), and that bolts
are properly torqued.
There are grease fittings on all moving parts of the suspension and they should be greased on a
weekly basis with a quality, low temperature grease (P/ N 4137061 00).
Finally, adjust the track tension and alignment. Track tension and alignment are most critical to top
speed. Make certain the track is aligned so that you have equal clearance between the slider shoe
and the track guides on each side of the snowmobile.
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