gas oil mixture

W

want to boat

Recruit
Joined
Jun 1, 2010
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1
Have a 1975 25hp Evinrude, model 25502, need to know the correct gas / oil mixture ratio.... any help gladly appreciated!
 
J

javsam

Chief Petty Officer
Joined
Aug 24, 2005
Messages
421
Re: gas oil mixture

50 to 1.
1 quart of two stroke TCWIII oil to 6 gallons of gas.
 
Vic.S

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,701
Re: gas oil mixture

50:1 is near enough 1 pint of oil in 6 galls

Do the maths 8 pints to a gallon so 6 gallons is 6x8=48 pints

Threfore 1 pint in 6 gallons is 48:1 near enough to 50:1

For smaller quantities 50:1 is 2.56 fluid ounces oil in 1 US gallon
(or 3.2 fluid ounces per Imperial (UK) gallon)

Most of the world works in litres though

50:1 is then 20ml oil per litre of gasoline.
 
kenmyfam

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,385
Re: gas oil mixture

want to boat said:
Have a 1975 25hp Evinrude, model 25502, need to know the correct gas / oil mixture ratio.... any help gladly appreciated!
Click to expand...

Slightly off subject but it sounds like this motor is new to you ??
Do yourself a favor and change the water pump impeller if it has not been done.
The other guys in the posts above have got the oilo thing covered.
Welcome to iboats.
 
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