The type of plug depends on the size of the engine. The plugs are under the chromed covers at the top of the cylinders.
One at a time.
The easiest way to tell is to pull one out. It will be marked what brand and part number on it.
Screwed into the heads.
The spark plug gap on a 1999 Suzuki Intruder 1500 is 0.035 inch. This is a common spark plug gap size for motorcycles.
how to replas spark plugs for suzuki wagon r
Where are the spark plugs on a 2001 Suzuki Vitara V-6
.035
on the back of the motor you will see the spark plug leads leading up to them
under the tank below the air intake
How do you change spark plugs on a 2001 suzuki vitata xl7
About .035 iches
not sure but i would set it at 28