ALL SPARK PLUGS ARE SOLD INDIVIDUALLY!! SPARK PLUGS ARE SOLD INDIVIDUALLY!! Up for sale is AUTOLITE 1976-1979 RD400 Yamaha SPARK PLUG XS4064/4 IRIDIUM XTREME SPORT. The vendor part number is XS4064. Please read the title to know what is for sale

• Engineered to meet or exceed OE designs and withstand the extreme operating temperatures experienced during a powersports engine's combustion
• Iridium-enhanced 0.6mm finewire design for improved ignitability, faster fuel combustion and a more focused ignition versus standard plugs
• Up to 26 percent quicker starts compared to that of standard plugs and as much as 21 percent less hydrocarbon emissions than standard plugs, which promotes better fuel efficiency and horsepower