The gas-to-oil mixture ratio for a 1989 Yamaha 125 is typically 32:1. This means you should mix 4 ounces of two-stroke oil with 1 gallon of gasoline. Always refer to the owner's manual for specific recommendations, as variations may exist based on the model or modifications.
It should be oil injected with a separate oil resivoir.
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Found this link via google and it answers your question. I have just purchased a 1990 waverunner LX and was looking for the same info. A PWC mechanic did tell me 32:1 ratio. http://www.dansmc.com/2stroke_oil.htm I own a Yamaha 1989 Wave runner, and the fuel to Oil ratio is 50:1. Hope this helps, i guess there is a bit of a difference between the 1990 adn 1989.
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500cc
32:1 is the perfect ratio for this bike, it doesnt over load it with oil while providing plenty of engine lubrication
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