Question About New Spark Plugs From Mail Order

I received new spark plugs I ordered in the mail today. They are NGK CR9EH-9. The Owner's Manual says to use CR8EH-9. Are the CR8EH-9's usable/good?

I thought I ordered the CR8EH-9's. So I went back and checked the web site and every time I entered the ST1300 I got the CR9EH-9 is the "Fit for your motorcycle". I went to a couple of other web sites and got the same thing.

Again can I use these CR9EH-9 spark plugs?

The manual for earlier bikes specifies CR7EH-9s for normal riding and CR8EH-9s for extended high-speed riding. I don't know if anything changed on later models.

The 7s run a bit hotter to help prevent fouling on shorter trips, where the colder 8s don't need to get as hot because running the engine for a long time keeps them clean. The 9s are probably too cold, so you'll want to exchange them for 7s or 8s depending on what kind of riding you do.

--Mark

Blrfl said:

The 9s are probably too cold, so you'll want to exchange them for 7s or 8s depending on what kind of riding you do.

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Thanks. I'm thinking so unless the change for all the sales recommendations can be explained. I'd rather not exchange if I don't have to.

The information you need is in the back of your owner's manual.

The sales recommendation could simply be wrong, too.

--Mark