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 624 GREUTATE 0.0410 Kg IMPACHETARE Bucata MATERIAL Fiberglass MODEL 624 NOTA Sold each - order one per cylinder (not one per machine) STIL Dual Stage TIP Power Reed YAMAHA WR 500 Z 4AA ALL 1993 YAMAHA WR 500 Z 4AA ALL 1992 YAMAHA YZ 490 3MJ2 AMERICA 1990 YAMAHA YZ 490 3MJ1 AMERICA 1989 YAMAHA YZ 250 2VM AMERICA 1988 YAMAHA YZ 250 2VM EUROPE 1988 YAMAHA YZ 490 2WH AMERICA 1988 YAMAHA YZ 250 2HH AMERICA 1987 YAMAHA YZ 250 2HH EUROPE 1987 YAMAHA YZ 490 2HJ AMERICA 1987 YAMAHA YZ 250 1LU ALL 1986 YAMAHA YZ 490 1LV AMERICA 1986 YAMAHA YZ 250 56A ALL 1985 YAMAHA YZ 490 57H AMERICA 1985 YAMAHA YZ 250 39X ALL 1984 YAMAHA YZ 490 40T AMERICA 1984