Technical data

Section 04 ENGINE
Sub-Section 04 (ROTARY VALVE)
04-04-10
ROTARY VALVE TIMING
CAUTION : Never use the ridge molded
in crankcase 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 :
For the following instructions, let’s use these
specifications as example :
OPENING : 130° 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 130° 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 130 ° 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.
ENGINE
TIMING
OPENING
BTDC
CLOSING
ATDC
587 130° ± 5 65° ± 5
717 147° ± 5 65° ± 5
787 146.5° ± 5 64° ± 5
-
3
6
0
3
5
0
3
4
0
3
3
0
3
2
0
3
1
0
3
0
0
2
9
0
2
8
0
2
7
0
2
6
0
2
5
0
2
4
0
2
3
0
2
2
0
2
1
0
2
0
0
1
9
0
1
8
0
1
7
0
1
6
0
1
5
0
1
4
0
1
3
0
1
2
0
1
1
0
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
1
0
0
1
1
0
1
2
0
1
3
0
1
4
0
1
5
0
1
6
0
1
7
0
1
8
0
1
9
0
2
0
0
2
1
0
2
2
0
2
3
0
2
4
0
2
5
0
2
6
0
2
7
0
2
8
0
2
9
0
3
0
0
3
1
0
3
2
0
3
3
0
3
4
0
3
5
0
3
6
0
A00B44A
295 000 007
295 000 065
1
F01D2IA
F01D3DA
130°
2
1
1
2
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