[Water Warrior 2]

Many of the newer vehicles have wireless ignitions systems with separate coils on each plug. Adds to efficiency and no need to replace wires that are probably the weakest point in the ignition system for many engines.
As an example of plug efficiency for a bike I had a wonderful surprise years ago. I fouled a plug on my KDX 200 two stroke. Popped in the spare plug, Platimun tipped or whatever was the apparent best according to opinion. Made the bike run like it was suddenly drinking steroids for fuel. The bike actually scared me for a while until I adapted to it's new found power and response.
I doubt that will be the case in more modern engines as the manufacturers try for the most efficiency. In the case of the GZ I would think it might benefit from a better quality plug. It is a price point bike and any higher quality/efficient plug might make a difference.