1969 4hp johnson water pump and oil ratio

[Maxx99]

i have a 69 4hp johnson, believe it or not it runs well. the tank says 16:1 ratio is that correct for that motor, seems like alot. also, when it is running it kinda sprays water out the holes in the back is that enough or should it be a full stream? the water pump is in perfect condition i took it apart and checked it, no cracks, nice and flexible just like new.

thanks
matt

 

[hidef]

Re: 1969 4hp johnson water pump and oil ratio

The little fours all spit water water out the relief ports you won't see a steady stream. The recommended oil ratio is 50:1 for your engine. Sounds like you have a an old tank that has been rigged to run with your engine.

 

[Rick.]

Re: 1969 4hp johnson water pump and oil ratio

Sounds like a great motor Matt. They don't get you anywhere fast but very dependable and fuel efficient. Wise of you to check out the impeller, new gear case oil would be a good idea. You should take the time to check the coils and points over the winter but for now, just enjoy it. Best of luck. Rick.

 

[1946Zephyr]

Re: 1969 4hp johnson water pump and oil ratio

The little fours all spit water water out the relief ports you won't see a steady stream. The recommended oil ratio is 50:1 for your engine. Sounds like you have a an old tank that has been rigged to run with your engine.

No, wait!! 50:1 is not the fuel mix. You'll roast those pistons and rods out, before you get acrossed the lake. There are no needle bearings in that motor, at all. I know, because I have one sitting here, that I had to rebuild, due to "Mr 50:1" If that tank says 16:1, then stay with those instructions. Doing so, will only ensure that your motor will last longer. Remember one thing: Oil is the cheapest thing you can put in your motor. Not only in running it, but also preventing costly repairs.

 

[Maxx99]

Re: 1969 4hp johnson water pump and oil ratio

ok i will stick with 16:1, cause i believe that is the correct tank. its my dads motor and he has owned it since it was new. just seemed kinda heavy compared to 50:1 now days.

already changed the lower unit oil.
took apart carb just to be sure, but its spotless.

i have a little jon boat i am gonna put it on just to play around with.

thanks for all the help, i appreciate it.

matt

 

[Rick.]

Re: 1969 4hp johnson water pump and oil ratio

Well I think it is 50/1. I know I bought a service manual for a buddy who has a 69 so I'll try and get a hold of him and see what it says. I know my 71 is 50/1. Your are not going to hurt anything by playing it cautious in the mean time. Rick.

 

[hidef]

Re: 1969 4hp johnson water pump and oil ratio

I just looked up the sales brochure for 1969 and the 4 horse for that year was redesigned and used needle bearings. In fact all OMCs in 1969 used 50:1. What is the model number of your outboard? That is the easiest way to verify that it is a 1969.

 

[Maxx99]

Re: 1969 4hp johnson water pump and oil ratio

It's 4w69 something. 4w69rs maybe
The 4w69 part is correct for sure.

 

[hidef]

Re: 1969 4hp johnson water pump and oil ratio

That is a 1969 4 horse.

 

[1946Zephyr]

Re: 1969 4hp johnson water pump and oil ratio

I just looked up the sales brochure for 1969 and the 4 horse for that year was redesigned and used needle bearings. In fact all OMCs in 1969 used 50:1. What is the model number of your outboard? That is the easiest way to verify that it is a 1969.

Sorry to say, but it doesn't have needles. I have one here that I rebuilt and the blown crank and rods to prove it. Friction based motors (those without needle bearings) should not run on any less than a 24:1 mixture. Non-friction based motors (those with needle bearings) are the ones that run on the 50:1 mix. Oddly enough, the 1 1/2 and 2 hp singles of this era did have needle bearings, but all the Light Twin 3 and 4hp models were still a babbot bearing set up. Later on, when the 4's were redesigned with the full shift, they were built with the non-friction powerhead. 1978 and on, the 4hp had the non-friction design.