Although I am using it on a motorcycle, I am using a racer such as an engine, so I am having trouble setting and I tried various plugs and got to the racing plug. Even if the heat value is taken together, even if it is a racing plug, the accumulation of carbon becomes surprisingly weak so that proper ignition is done, accompanied by it, the setting of the cab is easy to set out and the power comes out as well. It is different from normal plug. The price will be a bit high, but I think that it is worth trying once to those who are having difficulty in setting because it is a motorcycle that added the hand to the engine.