What spark plugs for my boat

[bcrock]

What spark plugs do my boat need?

It is a 1991 Johnson 120HP V4.

Also can I get these at any auto store or do I have to go to a marine store. There isnt any marine shops around me. Also what would be the gap measurement?

 

[hardwater fisherman]

According to shop evinrude Champion QL-77JC4 and optional Champion QL16V. Both are gaped at .030. I dont know what the difference is between the two. I order my Champion plugs from an auto parts store.

 

[60sboater]

I got Champions for a 25 Johnson at Auto Zone.

 

[Chris1956]

Sparks plugs bought at an auto parts store will usually be cheaper than ones bought at a marine store or dealer. Maybe by 300%. Of course, not all auto parts stores stock them. You will need to poke around.

Some Wallyworlds will stock marine plugs as well.

 

[bcrock]

Thanks

 

[Vic.S]

According to shop evinrude Champion QL-77JC4 and optional Champion QL16V. Both are gaped at .030. I dont know what the difference is between the two. I order my Champion plugs from an auto parts store.

QL 16V are surface gap!