NGK Racing Spark Plug - R0451B-8 induction hardened SPCC steel with

induction hardened SPCC steel with internal clearances particularly suitable to off road racing use (high shocks and loads)

with a 2mm tube ø28

superior materials and precision manufacturing processes to create factory racing parts available to everyone

So our R&D team went to work to optimize the new Yamaha

you have the choice of purchasing an EXP 4

NGK Racing Spark Plug - R0451B-8 induction hardened SPCC steel withThe Racing Spark Plug intended for competition should be able to resist to extreme conditions: Repeated acceleration and deceleration with power Intensive engine operating at high rev. Extreme condition inside combustion chamber such as temperature variation, pressure, vibration and turbulences cannot be sustained by a standard spark plug.