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Fuel mix ratio for 115 hp force outboard engine

Trying to find the fuel Mix ratio for my engine. 16 to 1 ? 50 to 1 ?

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50:1 ratio

Posted on May 23, 2009

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Posted on Jan 02, 2017

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I have an Evinrude 7.5hp outboard motor.Mod# 8RC1A SN# 0178194. What Year of manufd? How to mix fuel & what octane fuel to use & what oil to use? Help me go fishing, thanks.


91 octane rating ( no e-mix fuels ) and proper outboard oil ( not normal engine oil)
outboard oil has a property that allows the oil residue to stick to the metal bits and helps prevent rust
e-mix fuels absorb moisture and and rusts out steel tanks , destroys rubber components and corrodes aluminium components
the model you have is not listed on any 7.5 hp engine from 1950 to 1958
model number starts at 4434 to 7512 to 7525 in 1958
for a better answer , talk with an evinrude service center who should have a chart listing your motor
units with oil injection are 50: 1 ratio and others are 6 gallons to 1 pint of oil which is around 45:1
I would seek advice from an evinrude service center for the correct fuel to oil ratio for your engine
to mix the fuel , put the oil in first then the flow from the bowser will effectively mix it up to start with
then fit the cap on the tank and shake it up yourself

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1 Answer

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the manual shows for a 100 :1 mix the ratio is 4 ounces of oil to 3 gallons of fuel
there are two engines and one is 50: 1 ratio so that would be 8 ounces of oil to 3 gallons of fuel
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1 Answer

What is the correct fuel mix ratio?


Hi Ron:
I'm assuming we're dealing with a 2 cycle outboard, without oil injection.
Best to provide the year, make, and size (HP) to get the really correct answer.
Otherwise, most current 2 cycle engines work with 50:1
Some older outboards ran with 32:1
If you google your engine info with the key words "fuel/oil ratio" you should get the exact info.
Cheers

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1 Answer

Evinrude outboards


Johnson and Evinrude carbureted 2-stroke outboards since 1964 require a 50:1 fuel to oil mixture (2%) on engines without an automatic oiling system - 6 gallons of gas to 1 pint of outboard oil.

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Why wont my 50 hp mariner start ?


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Fuel mix ratio for outboards


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1 Answer

My 1999 150 hp Johnson outboard skips at idle and started stalling at wake speeds. Was running fine until I tried it out for first time this year.


Fuel mix is a common cause of this kind of performance. Take special care to follow the manufactures instructions on fuel mix, most modern outboards run on100 to 1 while it is easy to continue an older mix like 50 or 33 to 1. Sometimes the mix is written on the engine cowl.

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Sounds like your running a bit rich. Try leaning down your air/fuel ratio.

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