DENSO IRIDIUM POWER spark plugs - IU 27A. Made in Japan. He wants us to use the standard Denso Y27FER-C plugs in the front 2 cylinders and the Denso Y31FER-C in the rears due to them running hotter.
The DENSO IRIDIUM POWER spark plugs are an excellent match for Triumph Daytona 675 and Street Triple 675 engines, known for their performance and quality.
