[BCfisher]

Hi guys. I just bought a used 2003 Yamaha 2stroke 25hp outboard. Im wondering what the correct oil to fuel ratio is? Thanks!

 

[Steelie Trav]

50:1 is a solid ratio. Has the motor been in use or in storage? If it has been in storage ofr any period I would run a tank of 25:1 or 30:1 to prime the cylinders. Afterwards stick to a 50:1, thats what I use on my Yamaha 55.

 

[fishortho]

Check with Can Tire and add a cleaning agent to your first run along with a leaner mix as S.T. indicated......This will burn a bit hotter, but clean out the cylinders, then 50-1 it is!......Should smoke a bit with the choke, then run clean as the choke is down and the rpm up........(Is the 25 on your 14 footer? ;D ;D).Ortho 8)

 

[slamdunk]

Good advice from the previous replies.

If the motor was winterized before it was put into storage, a cleaning agent is a good idea. A can is not expensive at all - $5 - $6 a can. Just remove the cowling, get the motor started and then squirt the cleaning agent into the carbs. The revs will slow down a bit, the motor will smoke like you won't believe, slow down in revs and then pick up again. Squirt some more in and repeat quite a few times. You'll notice the volume of smoke will decrease the more times you do it.

But, more importantly, you should really get a hold of the manual for the motor and follow their instructions...if you can afford the motor, you can afford the manual....

Good luck with it...

 

[BCfisher]

Thanks for the tips guys! I will pick up a bottle of cleaning agent.
Cheers

 

[paulo]

Try giving Mike at Northwest Yamaha a call. He will be able to tell you anything you need to know. I have a /03 9.9 and it runs 100:1. I just bought a /07 90h 2 stroke and it runs straight gas with oil injection. You really should get a hold of the manual or talk to Mike. Cheers.Paul.

 

[BCfisher]

Thats a great idea paulo. I will call him first and take it in to get inspected.
Thanks

 

[Fishaholic]

I would definateley lean to the 100:1 side of things for that motor, be sure to check, 50:1 wouldnt make it very happy if it wasnt supposed to run on it

 

[steve]

Definitly check with a yamaha dealer for the oil mixture, they really carbon up with too much mix and won't run well at all. You'll need a good can of decarbon to fix that.

 

[South Texas Salt]

Get a manual for the motor, follow it, just my comments. Salt.

 

[Barba]

Check out this link:

http://web.petabox.bibalex.org/web/20010730192737/goa-northcoastoil.com/tips/obmixing.html

 

[Jimmy]

I have a 2003 20 hp yamaha and it is 100:1 and I use the Yamaha oil stay away from canadian tire or gas station oils as they only meet minumum standards. It is expensive but I use 1 liter per year that is 100 liters of gas per liter of oil.

Call you local yamaha dealer and they will tell you.

 

[JBarns]

50:1 is pretty average or 2%. I used to mix a lot of two stroke gas and used a 100 cc syringe to mix the right amount of oil to gas pumped. I always filled the tank and never Jerry cans. I made a little conversion table for gas to oil, ex. X.X L of gas to XX cc's of oil. worked like a charm