BOMBARDIER SEA-DOO GS 5626 1998, Shop Manual

Page: 136 / 426

Section 04 ENGINE
Subsection 07 (ROTARY VALVE)
04-07-10
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.
CLOSING MARK
Step : Top of MAG inlet port.
Align 360
°
line of degree wheel
Step : Find 65
°
on degree wheel and mark here
ENGINE
TIMING
OPENING
BTDC
CLOSING
ATDC
717 147° ± 5 65.5° ± 5
787 147° ± 5 63.5° ± 5
1
F01D2IA
F01D3DC
147°
2
1
1
2
F01D3EB
65°
1
2
1
2