You`re right, it says:

Verify spark plug threads are clean and dry.

Is there something in that statement that I am missing?

 

Back when I worked on them for a living, I didn't use anything on NGKs but did on Champion..

 

That would be around 30,000 miles for a lot of us.

 

@Taxgod4u some do have kickstands, just none of the big bikes that I know of. I just bought this for my girlfriend to get comfy on before she steps up to a soft tail. Street 750.

 

I haven’t really tallied between bikes but I’m sure I’m not hitting 30k on any of them. I am also sure I don’t need to worry about it because $30 every two or three years won’t slow me down. I’ll just replace them and roll on.

Cars and other bikes have the same things. Oil and plugs after so many miles or time.