Information on 15 HP Johnson

[cdru]

Model # 10R77A Would like to know the year, what plugs to use and the gap, and the oil mixture. Engine runs fine. Thanks cdru

 

[farnsp]

That number turns out to be a 1977 9.9hp rope start. Spark plugs call for QL77JC4 or QL82C gapped at .030. Gas should be mixed 50/1.

 

[cdru]

Thank you. I guess I had a Sr. moment. I knew it was a 9.9, not 15 HP. Thanks again. cdru

 

[majkmann]

L77JC4 now translates to Champion 821M