1962 Evinrude Starfire 75hp gas/oil mix

[joe1267]

I have what is probably a stupid question, but I am going to ask anyway. I just bought a '59 Aristocraft with this engine on it. Inside the cowling it is clearly marked that the ration should be 24:1, but I have also read that todays oils are better and that this ratio may bog down the motor causing poor running. I have already ordered a service manual. If someone can please set me straight, I would appreciate it.The motor runs like a bear and has been well maintained.


Joe

 

[Joe Reeves]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

The original mixture was 24/1 BUT all of the moving parts incorporated within that V4 75hp powerhead have either needle, ball, or roller bearings. As such, you can safely use the later 50/1 mixture............


1 pint of TCW-III 50/1 oil to 6 gallons of gasoline. A 87 octane rating will be fine.

 

[F_R]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

The original mixture was 24/1 BUT all of the moving parts incorporated within that V4 75hp powerhead have either needle, ball, or roller bearings. As such, you can safely use the later 50/1 mixture............


1 pint of TCW-III 50/1 oil to 6 gallons of gasoline. A 87 octane rating will be fine.

And I agree, but you will get a lot of different opinions on that subject. If it blows up, it was going to blow anyway. Listen to whatever you want to hear, I guess.

 

[JB]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

Joe Reeves advice is good IF the only factors involved are bearings. That is probably true.

On the other hand BRP still calls for 24:1 in 1962 OMC engines.

iboats' "official" position is to do what the maker tells you to do.

Oiling 2 stroke fuel is like drinking water. More than you need is harmless, less than you need will kill you.

 

[F_R]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

Joe Reeves advice is good IF the only factors involved are bearings. That is probably true.

On the other hand BRP still calls for 24:1 in 1962 OMC engines.

iboats' "official" position is to do what the maker tells you to do.

Oiling 2 stroke fuel is like drinking water. More than you need is harmless, less than you need will kill you.

"iboats' "official" position is to do what the maker tells you to do." Can't argue with that. The maker was OMC, not BRP. They said 50:1 if using their oil. Next question is of course, is TCW-3 as good or better than OMC oil of the day?

 

[JB]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

TC-W3 is probably even better than the OMC oil of 1963.

However, BRP now owns the brand and calls for 24:1 with TC-W3 oil. That is what I call for, and why.

I don't know why I even comment on these topics. Some well-meaning shade tree will now come along and tell how he and all his customers have been running Drug Store castor oil at 100:1 for 50 years and never blew an engine up.

 

[F_R]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

TC-W3 is probably even better than the OMC oil of 1963.

However, BRP now owns the brand and calls for 24:1 with TC-W3 oil. That is what I call for, and why.

I don't know why I even comment on these topics. Some well-meaning shade tree will now come along and tell how he and all his customers have been running Drug Store castor oil at 100:1 for 50 years and never blew an engine up.

I totally agree, I don't know why I comment either. That is why I rarely comment on the subject myself. No matter what we say, somebody has a different opinion. I was there, face to face with the OMC factory engineers and service manager when OMC said what they said. Of course we all know what happened to OMC. And BRP engineers see it differently. But what BRP doesn't explain is why the same engine made in different years with the same tolerances requires different oiling.

As I said, everybody will believe what they want to hear, so I'll quit commenting on the subject. What do I care anyway... At my age, I only need to run my old two-strokes a few more years before the fanatics ban them because of oil discharge. Hey, I've even started wearing my life jacket because I'm not as steady as I used to be and might fall out of the boat.

 

[JB]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

I hope nobody took my "shadetree" comment as a shot at Joe and F R. These guys are among our most helpful and most expert members.

I consider myself a shadetree wrench, because my degrees are not in chemical or mechanical engineering, but I have been messing with small JohnnyRudes for about 60 years. I have learned at least these two things about them:

1. Discovering that I can get away with doing something differently than OMC's instructions does not constitute improvement and usually involves increased risk of failure.

2. Doing a task on an outboard without a Manual or lots of experience doing that same task with the help of a Manual is an invitation to disaster.

 

[Joe Reeves]

Re: 1962 Evinrude Starfire 75hp gas/oil mix

No offense taken JB. I only comment because I'm right (grin).