NEED HELP : 1987 Yamaha 25sh 2-stroke outboard gasoline mixture rate

[jdmjunkiemonkie]

I just recently acquire a boat with a 25sh yamaha outboard. I need to know the Fuel Mixture of gasoline and 2 stroke oil. I heard it was 100:1 ratio. please confirm. Thanks

 

[robert graham]

Re: 1987 Yamaha 25sh 2-stroke outboard

Re: 1987 Yamaha 25sh 2-stroke outboard

use 2.6 ounces of outboard motor oil per gallon of gasoline, about 1 ounce of Yamaha Ringfree per 10 gallons of gasoline and about an ounce of fuel stabilizer like Sta-Bil or Seafoam per gallon of gasoline. That with a fuel/water separator on your transom and you will eliminate most of fuel related problems. Good luck!

 

[jdmjunkiemonkie]

Re: 1987 Yamaha 25sh 2-stroke outboard

Re: 1987 Yamaha 25sh 2-stroke outboard

so the fuel mixture isnt just pure outboard motor oil. i have to add the others into it?

 

[deejaycee_2000]

Re: 1987 Yamaha 25sh 2-stroke outboard

Re: 1987 Yamaha 25sh 2-stroke outboard

you don't have to add the others .... it is just for extra care, but what you need to run is fuel / oil ratio of 50:1 ..... NOT 100:1

 

[blared]

Re: NEED HELP : 1987 Yamaha 25sh 2-stroke outboard gasoline mixture rate

50:1 is the right mix for 2 strokes you can add a little more for break in period if it is new.

 

[robert graham]

Re: NEED HELP : 1987 Yamaha 25sh 2-stroke outboard gasoline mixture rate

better use the stabilizers like Sta-Bil or Seafoam to eliminate most fuel related problems, especially with the new ethanol gasolines. On a 25HP 2 stroke motor the additives will only cost you a few cents per tank of gas and will be worth it!

 

[boben2830]

Re: NEED HELP : 1987 Yamaha 25sh 2-stroke outboard gasoline mixture rate

Please check with a dealer. This ratio should be 100:1.Too much oil will foul plugs and run like poop!!!

 

[deejaycee_2000]

Re: NEED HELP : 1987 Yamaha 25sh 2-stroke outboard gasoline mixture rate

Always 50:1 ......

 

[rodbolt]

Re: NEED HELP : 1987 Yamaha 25sh 2-stroke outboard gasoline mixture rate

100 to 1 is what the owners manual says.
it will work but leaves NO margin for any subsystem degrdation.
my reccomendation is 50 to 1.
no your not going to foul plugs and its not going to run like poop just by running 50 to 1.