Motorcycle Spark Plugs in a Pack of 10 Spark plugs have to withstand temperatures far in excess of 2000°C and pressures of 70 bar and above in the engine's combustion chambers, not to mention the chemical stress resulting from the combustion process. So it's no wonder that they eventually wear out. When the time comes, you should always use high-quality replacement spark plugs. At Louis you will find the best quality spark plugs, including in packs of 10. The Louis Bike Database shows you which spark plugs you need for your machine.