Sea-doo 1997 GSI, Shop Manual

Page: 91 / 372

Section 03 ENGINE
Sub-Section 07 (ROTARY VALVE)
03-07-10
ROTARY VALVE TIMING
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:
For the following instructions, let’s use these
specifications as example:
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 de-
gree wheel with BOTTOM of MAG side inlet
port. Then, find 147
°
line on 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 degree wheel and mark here
NOTE: Do not rotate the crankshaft.
– For closing mark, first align 360
°
line of degree
wheel with TOP of MAG side inlet port. Then,
find 65
°
line on degree wheel and mark crank-
case at this point.
-
CAUTION
Never use the ridge molded in crankcase as
a timing mark.
ENGINE
TIMING
OPENING
BTDC
CLOSING
ATDC
717D 130° ± 5 55° ± 5
717 147° ± 5 65.5° ± 5
787 146.5° ± 5 64° ± 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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