2 stroke oil mixing

[Absolutetruthz]

I recently purchased a 1968 Johnson 6 hp outboard, does anyone know what the oil/fuel mixture ratio would be for that motor?

 

[tashasdaddy]

Re: 2 stroke oil mixing

according to my manual mix is 50:1 spark plug Champion J4J gapped at .030. (if doing a lot of trolling, gap at .035 or .040) for better trolling speed. when was the impeller last changed. if you don't know, do it before you burn up a sweet little engine. welcome to iboats.

 

[steelespike]

Re: 2 stroke oil mixing

50:1 is the correct factory reccomended ratio.
There is some evidence that something closer to 40:1 is better as these motors still have a lot of bushing bearings.There have been failures on 50 :1 If you are mostly trolling you are probably ok.Just be careful not to skimp.

 

[Salmonseeker]

Re: 2 stroke oil mixing

Tashasdaddy,

What is the benefit of using a larger spark gap when doing alot of trolling? How would this change performance at WOT? Does this apply to other motors as well?

Thanks

 

[Absolutetruthz]

Re: 2 stroke oil mixing

according to my manual mix is 50:1 spark plug Champion J4J gapped at .030. (if doing a lot of trolling, gap at .035 or .040) for better trolling speed. when was the impeller last changed. if you don't know, do it before you burn up a sweet little engine. welcome to iboats.

 

[Absolutetruthz]

Re: 2 stroke oil mixing

thankyou so much for your help. By the way, what is an impeller?

 

[gss036]

Re: 2 stroke oil mixing

The "Water pump" is called an impeller.
Is the motor army green in color? I used to have a 4 hp about that vinage, it was a very good motor, just not enough power for anything but a flat piece of water w/o any wind.

 

[DJ]

Re: 2 stroke oil mixing

The "impeller" is the water pump. The engine is WATER COOLED, just like your car. No water-engine burns up. Simple as that.

Unlike cars, the water pump in an outboard is a scheduled maintenance item.

It is located, on your 6, between the lower unit and exhaust leg. Look for a "swelled area" just above the plate above the propeller. That's the water pump housing.

If you do not change it, you will, most likely, melt the engine. That wrecks your day and a fine engine.

Service manuals, that will suit your needs, are available here on iboats.

Look here.

http://www.iboats.com/mall/?cart_id...87556127&search_type=keyword&keywords=manuals