The denso u-groove spark plug for polaris apollo 340 1979-1980 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: 24 hex size imperial: 13 16 hex size metric: 20.6 Mm hex size: 20.6 Mm 13 16 model: w24es-u product name: spark plug research value: finalized riding style: adventure touring dual-sport atv off-road snow street utv watercraft to fit: arctic cat pantera 440 1989 all models arctic cat pantera 440 1990 all models arctic cat pantera 440 1991 all models arctic cat pantera 440 1992 all models arctic cat panther 340 1998 all models arctic cat panther 340 1999 all models arctic cat panther 340 2000 all models honda cb 250 g 1974 european models honda cb 250 g 1975 european models honda cb 250 g 1976 european models honda cb 250 g 1977 european models honda mbx 50 sd 1985 european models honda mbx 50 sd 1986 european models honda mbx 50 sd 1987 european models honda mtx 50 s 1984 european models honda mtx 50 s 1985 european models kawasaki drifter 440 1979 all models kawas...