1964 Johnson 40hp & Johnson 6hp

[Dave H.]

Hi, I recently aquired a 1964 Johnson 40 and a 1962 Johnson 6hp. My mechanic told me the 40hp needs a 20:1 mixture of gas to oil. That seems a little rich to me - is he right? What about the 6hp? The same mixture?<br /><br />Both motors have been stored for 20+ years and will be ready for a test start soon. <br /><br />Hope you all can help<br /><br />Dave H.

 

[DJ]

Re: 1964 Johnson 40hp & Johnson 6hp

David,<br /><br />Both are 24:1.<br /><br />Many folks on this board mix their older engines a little thinner-because of the modern oils.<br /><br />I run a 1958 7 1/2 Evin. on a little under 40:1.

 

[Franki]

Re: 1964 Johnson 40hp & Johnson 6hp

I always ran my old lark40 evinrude at 32:1.. never had a problem..<br /><br />I figure that the oil that was around in the 60's can't hold a candle to whats around now...<br /><br />and in the 60's they suggested 24:1 so using modern oils, the same effect (lubrication) should be achievable at much lower levels of oil.. I was never confident enough to move to 50:1 though.. in fact I have trouble doing that with my 72 model johnson, which was designed for 50:1.. <br /><br />regards<br /><br />Frank

 

[Kramer]

Re: 1964 Johnson 40hp & Johnson 6hp

David<br /><br /> I bought a boat with a 1965 Johnson 40hp last year. Came with the service manual. A quick look did not reveal a specific ratio that is recommended. I'll have to look a bit deeper. <br /><br />Are you familiar with this motor? I'm having some trouble with mine and not sure what to do. (see my post in engines forum) Good luck getting yours running.<br /><br />Giddyup<br /><br />Kramer

 

[fireman 757]

Re: 1964 Johnson 40hp & Johnson 6hp

Most of us that run these old engines seem to like 32:1 with a GOOD QUALITY 2 cycle oil.

 

[Dave H.]

Re: 1964 Johnson 40hp & Johnson 6hp

Thanks all for the advice. 32:1 it is. It makes sense to me.<br />Kramer: my small engine experience is in chainsaws. I have a feeling I'll get to know this motor pretty well after I get it back from my mechanic. <br /><br />Good luck with it.