Part: Spark Plug NGK D8HA for Honda CT90 / Trail 90
Why You Need This: Spark plug swap is part of the standard vintage motorcycle maintenance list of the Honda CT90 / Trail 90. Too bad that over the years some knuckle dragger with a wrench just popped in whatever plug fit in the hole, so there is no telling what might show up on your bike. The correct spark plug for the Honda CT90 / Trail 90 is the NGK D8HA. Sold individually, two are needed per bike. If you are doing some carburetor jet tuning get a few sets to read the color of the porcelain tip based on fuel mixture. These NGK D8HA use a small size 18 mm hex and our long reach spark plug socket will take them out with ease.
Installation Tip: Each spark plug will come with a terminal nut on it so unscrew the terminal nut on top of the plug to expose the threads. More information can be found in our article on how to remove the spark plug terminal nut. Gap the plugs to .030", use a dab of light oil on the threads and tighten till snug.
