593HO Alternate Piston
#33588 from Formula/Sports Racing Committee · Rule change · TB 23-01 (2023-01 Fastrack)
In F600, GCR section 9.1.1.D.14.H, change as follows:
"Kawasaki and Rotax 494/493 engines: “OEM Type” replacement pistons of cast aluminum construction permitted. Must matchOEM design, specifications, and compression ratio (such as SPI/Kimpex). No forged pistons permitted, except as specified in9.1.1.D.14.I. Cast replacement pistons
Only the following cast replacement pistons are permitted:
1. Kawasaki and Rotax 494/493 engines: "OEM Type" replacement pistons of cast aluminum construction permitted. Must
match OEM design, specifications, and compression ratio (such as SPI/Kimpex). No forged pistons permitted, except as specified
in 9.1.1.D.14.I.
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2. Rotax 593 HO: Sports Performance 1 Products # 54-776PS cast replacement piston is permitted."
In F600, GCR section 9.1.1.D.14.I, change as follows:
"Forged replacement pistons"
In F600, GCR section 9.1.1.D.14.I, change as follows:
"3. Rotax 593 non-HO (0.010” overbore): Rotax P/N 420889171"
In F600, GCR section 9.1.1.D.14.J, change as follows:
"Overbore replacement pistons"
In F600, GCR section 9.1.1.D.14, change as follows:
"K. Rotax 593 non-HO engine only: Rotax OEM 0.010" overbore piston P/N 420889171 is permitted. Engines may be overboredas specified by Rotax so that this piston may be fitted."