NGK Spark Plugs CR9E(per 10)NGK Spark Plugs CR9E(per 10). NGK Spark Plugs CR9E (Per 10). Part Type : Engine Parts > Spark Plugs & Accessories. Motorcycle racing has always been a tough testing ground for spark plugs. From temperamental high powered two strokes of days gone by to the latest MotoGP machines, this hig.