650 mercury and thats all I know!

[abs2010]

Hi guys!<br /><br />I have just recently bought a boat that has what looks to be a 70's model 650 mercury blue band outboard on it, I would like to know what you guys think of this engine? runs very well from what I can tell, also could you please tell me what the fuel mixture is for these engins? do I have to use leaded or can I use unleaded fuel?<br /><br />Thanks<br /><br />abs2010

 

[inlineal]

Re: 650 mercury and thats all I know!

The mixture should be 50-1...a pint to six U.S. gallons ...you guys use the imperial gallon down under.???...unleaded fuel should be Ok....Is this motor 3 or 4 cylinder.??...

 

[Dunaruna]

Re: 650 mercury and thats all I know!

Unleaded is o/k (you've got no choice, leaded is no longer available anyway).<br /><br />Before metric, we used imperial gallons, but now it all metric.<br /><br />50:1 is - 200ML (milli-litres) of oil for every 10 litres of fuel. <br /><br />The average outboard fuel container is 22.5 litres (5 imp gallons or 6 US gallons, confused yet?). You would put 450ML of oil into a 22.5L container.

 

[joblo33]

Re: 650 mercury and thats all I know!

I always just consider my 22.5L containers as 25L when mixing and put in 500mL. It's easier on the old engine that way and I just dump half of the 1 litre bottle into each of my tanks.<br />Can you tell us the serial number of your engine? (Stamped in a plate above the transom mount) With the # we can tell you the exact year of your motor.<br />Eric

 

[inlineal]

Re: 650 mercury and thats all I know!

DUH.!!..Of course there is no leaded...I misread I guess unleaded or premium unleaded...I'm lucky for sure to only have to deal with a pint to six...of course thats what we are used to....Al

 

[abs2010]

Re: 650 mercury and thats all I know!

Thanks for all the info guys! inlineal it is the 3 cylinder engine, its my first boat so you guys might be hearing a lot more of me!! Eric B i will try and get the engine number tonight.<br /><br />Thank goodness I found this site!!

 

[joblo33]

Re: 650 mercury and thats all I know!

Well 3 cylinders tells us it's a 1972-1976.<br />Eric