While Keihin dual FCR41 kits for carbureted Ducati Monsters and Supersports (SS) are plentiful, the carburetors for dual FCR39 kits (for 600s and 750s) are backordered until April. If you order a FCR39 kit now, your order will be queued and grouped with our other FCR39 backorders. The Keihin FCR carburetor kits are wildly popular modifications for carbureted Ducatis from 1991 through 2001. These carburetors provide an impressive improvement in throttle response coupled with improved performance AND fuel economy. Applicable models: Keihin FCR 41 (available): 1991 through 1998 Ducati Supersport 900 (900SS, 900SS/SL, 900SS/SP, 900SS/CR, 900SS/FE) 1994 through 1999 Ducati Monster 900 (M900, M900s) Keihin FCR 39 (backorder until April 2007): 1993 through 1998 Ducati Supersport 750 (750 SS) all through 2001 Ducati Monster 750 (M750, M750 Dark) All Ducati 600 (583cc) Supersport and Monster (M600, M600 Dark, 600SS) Note: EFI models do not have carburetors and thus are not applicable for FCR carburetor upgrade: Monster 620 (618cc), 800, 1000, S2R family. 2002 Monster 750 and 900 models are also fuel injected.