Allow the #420924502 Rotary Valve in the Rotax Model 494 Engine.
#33584 from Scott Thorp · Rule change · TB 23-02 (2023-02 Fastrack)
In F600, GCR section 9.1.1.D.14, change as follows:
"Rotax Model 494, and Model 493, and Model 593 must use a single expansion chamber and must be equipped with electricand/or a pull starter,; an electric starter may be added. and Rotax 494 non-RAVE engine must use the 494 non-RAVE rotor valve,
Ski Doo part numbers 420 924 509 or 420 924 508, 147 degree designation. Rotax 494 RAVE engine may use either the 494 non-
RAVE rotor valve or the stock RAVE rotor valve, Ski Doo part number 420 924 502, 159 degree designation. RAVE
valves (exhaust) may be blocked in the "full open" position or left as delivered. 494 RAVE and non-RAVE cylinder heads may not
be interchanged between engines. Rotax 593 engine may be in a carbureted, non-HO or HO version; and must run inlet tract
restrictors, Cometic gasket part numbers A0242SP1020A or MA0242SP1063A, one in each tract immediately after the
Show 5 more lines
carburetor; single expansion chamber; electric and/or pull starter. Alternate restrictor plate option allowed the Rotax 593engine part number MA0242SP1063A."
In F600 engine table, Rotax 494 RAVE, change the notes as follows:
"Must use either the 494 non-RAVE rotor valve (Ski Doo part numbers 420 924 509 or 420 924 508, 147 degree designation) or
the stock 494 RAVE rotor valve (Ski Doo part 420 924 502, 159 degree designation)."