The gap for this car is 0.024" to 0.028."
The most common reason for a Honda 400EX not to fire is the need for a new spark plug. Try replacing the spark plug to see if that fixes the problem.
0.028
The Honda 400EX is equipped with one spark plug. This single-cylinder ATV features a 397cc engine, and its design requires just one spark plug for ignition. Regular maintenance of the spark plug is essential for optimal performance.
You need an 18 mm spark plug socket.
The stock spark plug is the NGK DPR8Z gapped at 24 to 28.
The 2002 Honda Civic EX engine uses coil-on-plug. There are no sparkplug wires.
It is very simple in between your engine head uner your headlights you should see you canble running to it
18mm. But it has to be a thin wall socket. The stock tool that came with it is best if you can find one.
you need a special 18mm socket wth very thin walls. i got mine from pitposse.com, it cost $20.
.030 - .035
.030 - .035in.
OEM are the best spark plug wires for the Honda cbr. These spark plug wires can be found at the local Honda dealership.