spark plug change
I've been riding a Z800 for three yrs now. The service agency says that the spark plugs need to be changed at 20,000 KM. I'm presently at 17,000 KM. Just need some inputs from experienced riders on the forum as to how long the original plugs last, what are the symptoms that indicate that a change is required and what are the best replacement plugs. Also, any DIY video or guidance that anyone can give?