Rotary Valve Adjustment - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

Section ENGINE PREPARATION
04

ROTARY VALVE ADJUSTMENT

The rotary valve controls the opening and the closing of the inlet ports. Therefore efficiency will
depend on the precision of installation.
ENGINE
N P E S
1975 245
345
1976 245,345
245, 345 (Competition)
1977 345
354
444
454
1978 345
345 (Cross Country)
354
444
254 (Super Stock)
354 (Super Stock)
454 (Super Stock)
1979 354
444
254 (Super Stock)
354 (Super Stock)
454 (Super Stock)
1980
354
454
464
1981 354
454
464 (Everest LC)
464 (Elite)
1982 454
464 (Everest LC)
464 (Elite)
1983 464 (Everest LC)
534
1984
354 (Competition)
462
465 (Competition)
534
1985 354 (Competition)
462
537
04-34
VALVE
P / N
420924205
420924205
420924205
420924220
420924200
420924220
420924205
420924207
420924200
420924202
420924200
420924205
420924207
420924207
420924207
420924200
420924205
420924207
420924207
420924207
420924200
420924207
420924205
420924200
420924207
420924205
420924200
420924207
420924205
420924200
420924205
420924207
420924207
420924205
420924205
420924207
420924207
420924200
420924200
TIMING
opening, closing
140°, 56°
140°, 56°
140°, 56°
140°, 70°
127°, 48°
132°, 50°
140°, 50°
130°, 80°
127°, 48°
128°, 37°
132°, 50°
140°, 50°
137°, 60°
129°, 73°
1 35°, 75°
132°, 52°
140°, 50°
132°, 70°
140°, 70°
132°, 52°
137°, 65°
1 50°, 49°
132°, 52°
137°, 65°
1 50°, 49°
125°, 60°
130°, 50°
150°, 49°
125°, 60°
1 50°, 49°
140°, 61°
1 30°, 73°
140°, 51°
1 50°, 49°
140°, 610
130°, 73°
132°, 52°
132°, 52°