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RVF400, Produced from 1994 to 1996, only officially sold in Japan
Other bikes that could be legal if the date range were opened up:
Honda CBR400RR (1988 to at least 2001)
Honda CB400 'Super Four' (1992 to current. 2008 units got EFI in addition to third gen VTEC...)
Kawasaki ZXR400 (1989 to 1999)
Suzuki GSX-R400 (1984 to 1999)
As one of the people racing the class in question, I'm ok with opening it up to newer machines. There are rumblings about Kawasaki bringing a 400 four cylinder machine to market again kicking around... That said I'm curious where the 1992 date came from as well. In the US the FZR400 ceased sales after 1990, the RVF doesn't appear until 1994, I'm not sure what machine CCS was trying to block with that cutoff?