55 or 56

[Pies1212!]

I am working on this 25 hp and wanted a recommendation on oil mixture.
Thanks
Piper

 

[racerone]

In 55 they were painted GREEN-----In 56 it was marketed as a 30 HP and was that color.----Post the model # of this machine.

 

[F_R]

Original mix was 24:1. Some will argue, but in my opinion, that motor will do just fine on 50:1. Having said that, some 1956 30 hp motors had bearing and seal problems. If it tears up on 50:1, it was going to do that anyway

 

[flashback]

Unless it's been maintained you can be sure it has lots of seal problems..

 

[F_R]

The seal problem I referred to was the lower crankshaft seal. An engineering screw-up used an inferior seal that allowed water ingestion into the crankcase, rusting all the bearings. Later production numbers fixed the problem.

 

[rolmops]

I had a few 1957 35 horse engines in that color and a 1958 in the same pattern but slightly different color patterns. The color name is holiday bronze.They all had pin needle bearings and could already be run on 1:50. (I never did). The one thing most people ignore when writing about oil mixes is that the 1950ies oil recommended was 30 weight engine oil and the modern outboard 2 stroke oil is of a much higher quality. I have always run a 1:32 mix on these old engines without ever a problem.

 

[jimmbo]

We ran a 57 35hp at 50:1 using the OMC Oils, never had any problems.
In fact, OMC had issued a Bulletin stating that a lot of their engines, made prior to the 1964 Model Year could run 50:1 as long as you used their Oil. The older 24:1 and 16:1 ratio was still in place for use with regular Outboard Oils, or Non-detergent SAE 30

 

[Pies1212!]

These are the only #

 

[Pies1212!]

Let me know where I could find more #s
Thanks
Piper

 

[F_R]

Your picture shows a 1956 30 hp hood. But they can be swapped. Model number is here between stern brackets. If it ain't there, somebody has removed it. If you will back off with that camera to show a shot at the rear, toward the spark plugs, we can tell you for sure 30 or 35 hp

 

[Pies1212!]

Guy I traded for said it was restored and bored to 35...
Will try to send more when ready to try to get running

 

[F_R]

You can't bore a 30hp to 35hp. But you can put a 35 powerhead on a 30. A picture can tell the truth.

 

[Pies1212!]

30 35 ok
I will send more pics
This is a fun project for my wife and I
Thanks for the great responses!!

 

[Pies1212!]

Should be cool to see it cruise our lake!
Thanks again

 

[cc67]

In 55 they were painted GREEN-----In 56 it was marketed as a 30 HP and was that color.----Post the model # of this machine.

Here's a 55 I did a fews back.

 

[Pies1212!]

Ok so 16 to 1
Or 24 to 1?

 

[jimmbo]

24:1 would be the recommended ratio. 16:1 is for better Mosquito Control

 

[Pies1212!]

I will post more pics when we dive into the motor
Thx again
Pipet