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An open-class RFS four-stroke motocrosser of 2003–2006, for big-bore four-stroke riders.
Same 510cc RFS engine as the 520 SX in an updated chassis; a 2005 chassis update is reported by one source.
510cc RFS SOHC motocrosser with Keihin FCR carburettor.
engine_cc computed from the cited bore x stroke.
No photos yet.