Most two-stroke engines that are used for boats require a 50:1 ratio although there are a number of exceptions. If you are the new owner of a used two-stroke boat motor, always check the manufacturer’s recommendation for the gas-to-oil ratio before you take the boat out for a test drive.
What is the oil to gas ratio for a 2-stroke outboard motor?
Use a 32:1 gasoline to oil ratio. One gallon of gasoline combined with 4 oz of two-cycle engine oil.
What is the proper oil to gas ratio for a 4 stroke marine engine?
Most marine requirements, such as personal water craft (PWC), jet skis and outboards, are 50:1, gas to oil.
Is it better to run lean or rich?
TLDR – running just a little lean could improve fuel economy and give extra power. However, run too lean and you risk engine failure because the engine runs too hot. Whereas running rich can waste fuel and increase pollution but will not damage the engine.
What is the best fuel mix for a Yamaha outboard motor?
Although 100:1 was the recommended fuel mix I preferred to use 50:1 to make sure that the engine didn’t seize when worked to hard. A 50:1 mix didn’t seem to coke it up either providing you used a good quality two stroke oil. I recently brought myself a used yamaha outboard but, I am a little bit confused about the fuel mix.
How much oil/gasoline do you use in your Yamaha Motor?
Unlike OMC, Yamaha seems to have stuck with a 1:100 oil/gasoline ratio recommendation for their motors. Are people comfortable with this? Much thanks. It is still running after 14 years aint it? I ran mine with a heavy hand so more like 75-80:1. There must have been a trend in the early 1990’s to see how little oil could be used in outboards.
Where can I find the fuel mix ratio for my outboard?
A good proportion of outboard manufacturers will print/inscribe/stamp the right fuel mix ratio somewhere on the unit itself.
How much oil should I put in my 2 stroke outboard?
Its only 1% oil. 50:1 contains twice as much oil ( 2%). Most 2 stroke outboards used 50:1 from about 1970 onwards. Before that they used even more oil. I would run it on 50:1 unless it caused any problems, in which case I’d go somewhere in between. Very probably 50:1 was recommended for the first few tank fulls when new
