There is only one. Because there is in one cylinder
The Honda Civic has four spark plugs, one for each cylinder.
2 spark plugs per cylinder.
8...
Six.
Four
4
2
It has 6 spark plugs. One for each cylinder.
This bike has a parallel twin cylinder engine so it has two spark plugs.
4
There are four spark plugs in this bike's engine as it has a four cylinder V.