[alantf]

In my hand book, Suzuki says to change the plug every 10,000 km (6,200 miles) I check mine frequently & have never needed to clean or re-gap it. When 10,000 km came up it was still in good condition, so I never changed it, & no problems yet. However, that's just MY bike. I'm not suggesting that all gzs will be the same. All I'm saying is, Check it regularly, & if it looks at all suspect, then change it. It's one of the least expensive bits of the bike, but you don't need to change it just for the sake of change.