NGK Multi-Ground Spark Plug (1633) YAMAHA YZ400 Try replacing the cap first

Try replacing the cap first

The other parts can be purchased in a kit 134-183 or individually

With a twist of the arm knob

Our Super-Lite +PLUS Double Backer is for the new Single Ply tracks using studs with large heads like our Power Point +PLUS stud

NGK Multi-Ground Spark Plug (1633) YAMAHA YZ400 Try replacing the cap firstNGK 1633 LMAR9D J Multi Ground Spark Plug Multi ground electrodes improve ignition capabilities and are less sensitive to increased voltage requirements due to gap growth. Designed to specific manufacturer ignition requirements, NGK's multi ground plugs maintain all the features of their standard plugs, including: Corrugated Ribs to Prevent Flashover Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer Copper