Rotary Valve Timing - Rotax 2005 717 RFI Engine Shop Manual

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.
Degree wheel (P/N 529 035 607)
6
6
TDC gauge (short) (P/N 295 000 143)
295000143
Rotary valve must be set so that timing occurs as
follows:
ENGINE
OPENING
BTDC
787 RFI 147° ± 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.
smr2005-084
TIMING
CLOSING
ATDC
63.5° ± 5
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Section 03 787 RFI ENGINE
Subsection 05 (ROTARY VALVE)
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.
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.
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