Sea-doo 2001 GS, Shop Manual

Page: 144 / 456

Section 04 ENGINE
Subsection 07 (ROTARY VALVE)
SMR2000-012_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 34
0
330
32
0
31
0
3
0
0
2
9
0
2
8
0
2
7
0
2
6
0
2
5
0
24
0
23
0
220
21
0
20 0
19 0 18
0
17
0
16
0
15
0
14
0
1
3
0
1
2
0
1
1
0
1
0
0
9
0
8
0
70
60
50
40
30
20
10
1 0
2 0
3 0
40
50
6
0
7
0
8
0
9
0
1
0
0
1
1
0
1
2
0
1
30
14
0
15
0
16
0
17
0
18 0 19
0
20
0
21
0
22
0
23
0
2
4
0
2
5
0
2
6
0
2
7
0
2
8
0
2
9
0
3
0
0
31
0
32
0
3 3
0
3 4 0
3 5 0
3 6 0
F00B0DA
295 000 007
295 000 143
1
F01D2IA
F01D3DC
147°
2
1
1
2
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