REDと学ぶ点火プラグの基本 

what is this about mate? Spark plugs comparison between red memory spark plugs? If the one that has the cyan colored Iridium Tough branded on the plugs is the one they are trying to sell, i believe those have the type of electrodes that will wear out sooner than the squarer shaped ones from denso

care to do some subtitling job for these vids?

咲弥TV 自分はわざとギャップ広げて火花散る幅大きくして(シックネスゲージ使用 )パワーアップ！とか言って下らないことしていました(笑) 調子のって大きくしすぎてピストンに穴開けた事もあります。。