BOMBARDIER 1996 Ski-doo MX Z440 Handbook page 282

Section 06 COMPETITION BULLETINS AND RACING PARTS
FRONT PORTION OF SUSPENSION
141 mm idler wheels
/ . / /
AO06 005046
Replace original center spring with a Blue/ Blue
(P/ N 4145591 00).
Replace original stopper strap with a 50 mm (2 in)
shorter one (P/ N 4860562 00).
Shock pivot can be bolted to front holes.
When installing track studs, replace both radiator
protectors with higher ones (P/ N 4148382 00).
FRONT SUSPENSION
Collapse front suspension until lower and upper
arms are horizontal. Tie suspension to limit travel
(reduced to 75 mm (3 in) in that position using
straps on shock bolts.
Replace carbide runners with standard runners
(p/ N 5050638 00).
DRIVE SYSTEM
DRIVE PULLEY
FRONT +
Replace original spring with a Violet (P/N 417
Additional idler
wheel set 2057 20) 254 lb (Comet P / N 207758A).
,
Install four large washers (P/ N 417 2057 08)
between spider and sliding half.
Remove washer (P/ N 417 2057 07) between
sliding half and fixed half. Drive belt side play will
be reduced to a minimum.
DRIVEN PULLEY
Install a 54° cam (P/N 4860563 00).
Adjust spring preload 6.4 kg (14 lb).
Engagement speed should beat 3600 RPM.
Maximum engine RPM is 8400.
Replace original top sprocket (25 th) with a 23-
tooth sprocket (P/ N 5040854 00).
Replace original bottom sprocket (40 th) with a
44-tooth sprocket (P/ N 5040855 00). Keep origi-
nal drive chain (72 links).
AIR SILENCER
Remove foams from both air silencer inlets.
o
NOTE : This is a service tip, no warranty
applies.
06-25