Are these the right spark plugs? 89 Evinrude 40hp

[kaivorth]

Bought an 89 40hp Evinrude. I believe this used to be oil injected, but it's been removed so I premix.

Champion Spark Plugs QL78YC. Are these the originals? Should I just get another set of these or are there better options out there?

 

[hardwater fisherman]

According to shop evinrude and other sites. The plugs should be QL78C. I do not know what the Y stands for or if it makes a difference.

 

[kaivorth]

Gapped to .030 and ready to go! I just wanted to make sure these weren't some generic ones the previous owner threw in. I question everything that guy did to this poor motor.

 

[jakedaawg]

Yes, use QL78YC

 

[Rustywrench]

'89 parts book is showing QL82C not YC. The Y is extended tip. In some cases the Y type plug was used, but not on this model that Imcan find? I don't remember if this was one of those cases? 1995 also shows QL82C! Don't believe you should use the extended tip in this application. At least check further before proceeding.

 

[kaivorth]

Interesting. What would symptoms be of using those plugs instead?