Corect Spark plug for 4.5 Evinrude

[Sylva-Ranger]

4.5 Evinrude 1984 ESRHCRM

Omc's on line part diagram say Champion QL77JC4
Evinrude 2013 Parts & Accessories Catalog say Champion QL86C
Champion Catalog say QL86C
Intertek service manual say QL77JC4
OMC's service manual say QL77JC4
Another OMC'S catalog say QL86C


Geberal rule :

Original and older littératures QL77JC4

Newer littératures QL86C



Do Evinrude made and update or change in the '80's or '90's ?

Which is the best ?

Thank You

 

[kbait]

I cannot find stated model #
4.5 Evinrude 1984 ESRHCRM
Can you confirm?

 

[Vic.S]

4.5 Evinrude 1984 ESRHCRM

Omc's on line part diagram say Champion QL77JC4
Evinrude 2013 Parts & Accessories Catalog say Champion QL86C
Champion Catalog say QL86C
Intertek service manual say QL77JC4
OMC's service manual say QL77JC4
Another OMC'S catalog say QL86C

Geberal rule :

Original and older littératures QL77JC4

Newer littératures QL86C

Do Evinrude made and update or change in the '80's or '90's ?

Which is the best ?

Thank You

You have misread the model number . Thet should be a "5" not an "S" ............ E5RHCRM

The currently recommended plugs are QL86C, gapped at 0.030"
If you detected any difference in use between them and QL77JC4 I'd be extremely surprised

 

[Sylva-Ranger]

Excuse is 5 instead of "S" my mistake during wrinting this post.

 

[Sylva-Ranger]

You have misread the model number . Thet should be a "5" not an "S" ............ E5RHCRM

The currently recommended plugs are QL86C, gapped at 0.030"
If you detected any difference in use between them and QL77JC4 I'd be extremely surprised

That whats i think to, but curious to know why they change number during the years,

Thank You !