717 Engines

Section 04 ENGINE (2-STROKE)
Subsection 06 (ROTARY VALVE)
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.
F00B0DB
529 035 607
295 000 143
Rotary valve must be set so that timing occurs as
follows:
ENGINE
OPENING
BTDC
360 350 340 330 320 310 300 290 280 270 260 250 240 230 220 210 200 19
1 0 2 0 3 0 40 5 0 6 0 7 0 80 9 0 10 0 11 0 12 0 1 3 0 1 4 0 15 0 1 6 0 17 0 18 0 19 0 20 0 21 0 2 20 23 0 2 4 0 2 50 2 6 0 2 7 0 2 8 0 2 9 0 3 0 0 3 10 3 2 0 3 30 34 0 35 0 36 0
0 180 170 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10
TIMING
CLOSING
ATDC
717 147° ±5 65.5° ±5
787 RFI 147° ±5 63.5° ±5
Timing Procedure
The following timing procedure example uses
these specifications:
OPENING: 147° BTDC
CLOSING: 65° ATDC
Proceed as follows:
– Turning crankshaft, bring MAG side piston to
Top Dead Center using a TDC gauge.
F01D2IA
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.
F01D3DC
2
1
147°
OPENING MARK
Step 1: Bottom of MAG inlet port. Align 360° line of degree wheel
Step 2: Find 147° on inner scale of 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 outer scale of degree wheel and
mark crankcase at this point.
162 smr2004-Complete Line Up
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