The denso u-groove spark plug for honda cb 900 c 1980-1981 is part of the latest collection from denso.Features: 100 percent pre-fired to ensure reliable operation copper core center electrode for superior thermal conductivity unique five-rib insulator reduces flashover and decreases voltage loss dual copper and glass seal bonds the center electrode and insulator together for a gas-tight seal. Original equipment in automotive applications specifications: center electrode projection: non-projected center electrode type: standard electrode tip material: nickel alloy ground electrode shape: u-groove heat range: 27 hex size imperial: 11 16 hex size metric: 18 mm hex size: 18 mm 11 16 model: x27es-u product name: spark plug research value: finalized riding style: adventure touring dual-sport atv off-road snow street utv watercraft to fit: honda cb 900 c 1980 custom american models honda cb 900 c 1981 custom american models honda cb 900 f 1981 super sport american models kawasaki en 450 1985 ltd 454 all models kawasaki en 450 1986 ltd 454 all models kawasaki en 450 1988 ltd 454 all models kawasaki en 450 1989 ltd 454 all models kawasaki en 450 1990 ltd 454 all models kawasaki en 500 1990 vulcan 500 all models kawasaki en 500 1991 vulcan 500 all models kawasaki en 500 1992 vulcan 500 all models kawasaki en 500 1993 vulcan 500 all models kawasaki en 500 1994 vulcan 500 all models kawasaki en 500 1995 vulcan 500 all models kawasaki en 500 1996 vulcan 500 ltd all models kawasaki en...