The denso u-groove spark plug for yamaha yfa 1 1994-2004 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: 22 hex size imperial: 5 8 hex size metric: 16 mm hex size: 16 mm 5 8 model: u22fs-u product name: spark plug research value: finalized riding style: adventure touring dual-sport atv off-road snow street utv watercraft to fit: yamaha yfa 1 1994 breeze american models yamaha yfa 1 1995 breeze american models yamaha yfa 1 1996 breeze american models yamaha yfa 1 1997 breeze american models yamaha yfa 1 1998 breeze american models yamaha yfa 1 1999 breeze american models yamaha yfa 1 2000 breeze american models yamaha yfa 1 2001 breeze american models yamaha yfa 1 2002 breeze american models yamaha yfa 1 2003 breeze american models yamaha yfa 1 2004 breeze american models yamaha yfm 100 1987 champ american models yamaha yfm 100 1988 champ american models yamaha yfm 100 1989 champ american models yamaha yfm 100 1990 champ american models yamaha yfm 100 1991 champ american mo...