NGK, spark plug DR7ES

Honda: 71-77 CB 500 Four 500cc; 71-77 CB 500 K Four 500cc; 75-78 CB 550 F Supersport 550cc; 77-78 CB 550 K Four 550cc. Kawasaki: 1983 ZR 400 400cc. Yamaha: 1984 XT 400 400cc; 82-83 XT 550 550cc; 1985 XT 600 600cc; 83-85 XT 600 Z 600cc.