Correct spark plugs for Johnson 60 hp J60TLERV (1994)

[Ben C]

Part Diagrams and Service manual calls for QL77JC4. I have a spark plug application chart calling forQL78YC. Is there a big difference between the 2 plugs and can anyone suggest which is preferred for this engine. Thanks in advance.
Ben

 

[racerone]

Go with the QL77JC4-!!!

 

[Ben C]

racerone- thanks! Always great to have advice from the pros
ben

 

[haffiman37]

You may use both. The QL78YC may improve the idling a bit and does not get that easily fouled.

 

[Ben C]

good to know since will be doing a good bit of idling.
Thanks for the help