Section 04
ENGINE
Subsection 07
(ROTARY VALVE)
SMR2002-026_04_07A.FM
04-07-9
ROTARY VALVE TIMING
CAUTION:
Never use the ridge molded in crank-
case as a timing mark.
The following tools are required to measure rotary
valve opening and closing angles in relation with
MAG side piston.
Rotary valve must be set so that timing occurs as
follows:
Timing Procedure
The following specifications are used in this pro-
cedure:
OPENING:
147° BTDC
CLOSING:
65° ATDC
Proceed as follows:
– Turning crankshaft, bring
MAG side
piston to
Top Dead Center using a TDC gauge.
1. Bring piston to TDC
– For
opening
mark, first align 360° line of degree
wheel with BOTTOM of
MAG side
inlet port.
Then, find 147° line on inner scale of degree
wheel and mark crankcase at this point.
OPENING MARK
Step
: Bottom of MAG inlet port.
Align 360° line of degree wheel
Step
: Find 147° on inner scale of degree wheel and mark here
NOTE:
Do not rotate the crankshaft.
ENGINE
TIMING
OPENING
BTDC
CLOSING
ATDC
717
147° ± 5
65.5° ± 5
787 RFI
147° ± 5
63.5° ± 5
360 350 340
330
320
310
30
0
29
0
28
0
27
0
26
0
25
0
240
230
220
210
200
190
180
170
160
15
0
14
0
13
0
12
0
11
0
10
0
90
80
70
60
50
40
30
20 10
10
20
30
40
50
60
70
80
90
10
0
11
0
12
0
13
0
140
150
160
170
180
19
0
200
210
22
0
23
0
24
0
25
0
26
0
27
0
28
0
29
0
30
0
31
0
32
0
330
340
350 360
F00B0DB
529 035 607
295 000 143
1
F01D2IA
F01D3DC
147°
2
1
1
2
www.SeaDooManuals.net
Summary of Contents for GTI 5558
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