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Evinrude 1978 model 150849 - 150 hp oil mixture help

Hey guys, I just bought a 17 foot bayliner with a 150 evinrude engine on it. It had a little bit of gas in the tank, but I forgot to ask the previous owner what the fuel / oil mixture was. And if it was oil injected, or if I have to actually pour oil down the gas chamber / mix it. Hopefully you guys might know.

If so how do I know hat the gas / oil mixes ok if I can't pull out the gas tank to shake it around? Can someone explain the process here, or let me know if it's oil injected(finger's crossed)?

Thanks a lot
-Mike
 
No oil injection in 78---------Mix a quality oil at 50:1------------Pour oil into the fuel tank and it will quickly mix with the gasoline.
 
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