Honda CB400TI Spark Plug
GarageDex's powersports data shows the Honda CB400TI uses a DR8EA spark plug.
Spark plug fitment by year
| Years | Standard plug | Iridium upgrade | Gap |
|---|---|---|---|
| 1978-1979 | DR8EA | - | - |
Match the exact part code, thread reach, and heat range. The iridium column is the same-fit upgrade for a longer service life.
Spark plugs for your Honda CB400TI
The recommended plug is a DR8EA. Match that code - spark plugs are thread-, reach-, and heat-range-specific, so the part number matters more than the brand. Gap it to spec before it goes in and you're done.
As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
Frequently asked
What spark plug does a Honda CB400TI take?
GarageDex's powersports data shows the Honda CB400TI uses a DR8EA spark plug.
How often should I change the spark plugs on a motorcycle?
Standard plugs typically want replacing every 8,000-12,000 miles (or per your service manual); iridium plugs go much longer. Fouled or worn plugs cause hard starts, misfires, and poor fuel economy - a cheap part that punches above its weight.