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.
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)
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....
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.
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.
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
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