ive got a Johnson 1964 40hp rkl-26s ive been running 24 to 1 mix.the plugs are a little gresey looking. some one sead to run 50 to 1 oil. but that make me nervice. how about 32 to 1 will that work out with tcw3 oil? thanks Bob
Hi, Bob, you can safely run your '64 Big Twin on TCW3 at a ratio of 50:1.
In deference to its age, you might mix it just a wee bit richer; at 40:1 you shouldn't have any fouling issues and the slightly richer (than 50:1) oil mix will promote good ring sealing and give the bearings a bit more lube as well.
If you're troubled by smoke, Amsoil and other major oil mfr's offer a "low-smoke" oil.
If you're running it wide open for most of it's usage I'd consider 24/1 or 32/1.
I was reading through a 1993 75hp OMC manual the other day helping a friend get it running and it mention if a lot of wide open usage is expected run 24/1. I found it interesting as 1993 is way after the 50/1 ratios were recommended. His 75hp is on a pontoon and it's super easy to run it wide open and hardly even know it. It's pushing a barge.
It's my understanding that some of the oil injected motors run more oil than 50/1 when under full throttle.
I thought that I read some where that in 64 thay switched to 50 to 1 but had to go back to 24 to 1 because thay had some motors that would not work on 50 to 1 . the one I have gits lots of oil at 50 to 1 and smokes a lot. so I think that iam going to go with 32 to 1. iam shere that will be ok. thanks for the help. bob