fuel/oil mixture -- motor age

[perkdp]

I just bought a 4 horse johnson and have no book on it. Based on a picture I saw, I believe it is about a 1968 model. What is the fuel/oil mixture and how can I convert the model / serial number to the year of production? <br /><br />I also have a 7 1/2 horse Murcury (mid 70s model) and have the same age and fuel questions for it. <br /><br />thanks...

 

[rickdb1boat]

Re: fuel/oil mixture -- motor age

Try Here:<br /><br /> Modelguide

 

[Lark40]

Re: fuel/oil mixture -- motor age

All Johnson/Evinrude engines were officially on a 50:1 gas/oil mixture as of 1964.

 

[perkdp]

Re: fuel/oil mixture -- motor age

Are there any remarks about my Mercury ??

 

[Scoop]

Re: fuel/oil mixture -- motor age

Mid 70's mercury should also be 50:1. Use a good TCW3 rated oil.

 

[perkdp]

Re: fuel/oil mixture -- motor age

thanks guys. <br />i found that i have a 1971 model johnson 4 horse and a 1975 model mercury 7.5 horse.