Maintenance - schedule or whenever?

[goof2]

Originally Posted by Gas Man

I use to change them on my 9R every year. Way over kill but there was no way I was going to pull them and not just replace them.

The recommended interval for a check, clean, regap, or replace on my bike's spark plugs is every 6 months or 6,000 km. I haven't been good about this and I suspect the previous owners weren't either.