Laboratory flow analysis proves Boyesen dual-stage reeds out-perform standard reeds They permit greater flow velocity over the entire range of operating pressures Increased performance from start-up to top acceleration Top racers and knowledgeable riders coast to coast make Boyesen Racing Reeds their first step in getting more power, more performance and more pleasure from their high-performance bikes Specificatii produs COD PRODUCATOR 644 GREUTATE 0.0360 Kg IMPACHETARE Bucata MATERIAL Fiberglass MODEL 644 NOTA Sold each - order one per cylinder (not one per machine) STIL Dual Stage TIP Power Reed YAMAHA WR 250 4JW AMERICA 1997 YAMAHA WR 250 Z 4JW AMERICA 1997 YAMAHA WR 250 Z 4JX AMERICA 1997 YAMAHA WR 250 Z 4XK AMERICA 1997 YAMAHA WR 250 Z 4XK EUROPE 1997 YAMAHA WR 250 4JW AMERICA 1996 YAMAHA WR 250 Z 4JW AMERICA 1996 YAMAHA WR 250 Z 4JX EUROPE 1996 YAMAHA YZ 250 4SR AMERICA 1996 YAMAHA YZ 250 4SR EUROPE 1996 YAMAHA WR 250 4JW AMERICA 1995 YAMAHA WR 250 Z 4JW AMERICA 1995 YAMAHA WR 250 Z 4JX EUROPE 1995 YAMAHA YZ 250 4MX AMERICA 1995 YAMAHA YZ 250 4MX EUROPE 1995 YAMAHA WR 250 4JW AMERICA 1994 YAMAHA WR 250 Z 4JW AMERICA 1994 YAMAHA WR 250 Z 4JX EUROPE 1994 YAMAHA YZ 250 4JX AMERICA 1994 YAMAHA YZ 250 4JX EUROPE 1994 YAMAHA WR 250 4DC AMERICA 1993 YAMAHA WR 250 Z 4DA EUROPE 1993 YAMAHA WR 250 Z 4DC AMERICA 1993 YAMAHA YZ 250 4EW AMERICA 1993 YAMAHA YZ 250 4EW EUROPE 1993 YAMAHA WR 250 4DC AMERICA 1992 YAMAHA WR 250 Z 4DA EUROPE 1992 YAMAHA WR 250 Z 4DC AMERICA 1992 YAMAHA YZ 250 4DA AMERICA 1992 YAMAHA YZ 250 4DA EUROPE 1992 YAMAHA WR 250 3RB AMERICA 1991 YAMAHA WR 250 Z 3RB AMERICA 1991 YAMAHA WR 250 Z 3XK EUROPE 1991 YAMAHA YZ 250 3XK AMERICA 1991 YAMAHA YZ 250 3XK EUROPE 1991 YAMAHA YZ 250 3SP AMERICA 1990 YAMAHA YZ 250 3SP EUROPE 1990 YAMAHA YZ 250 WR 3RB ALL 1990