The only engines that require 89 octane are the SHO 150, 225, 250, the f200 lightweight, the f250 3.3 liter, the f300 4.2 liter offshore and the f350 v-8. Run either one. Everything else runs on 87 octane. Burning 87-octane gasoline in a two-stroke outboard causes carbon buildup that shortens engine life. No gain to be had. Some high-performance engines may require a higher octane rating than “regular” 87 octane. Mercury's proven TwoStroke engines deliver easy starting, gutsy performance, and great all-round reliability. Minimum required octane for all yamaha outboards (except F250 and F350 89 octane) is 86 octane. high octane fuel in 2 stroke December 8, 2020 / 0 Comments / in Uncategorized / by / 0 Comments / in Uncategorized / by Point is, the lower octane will burn more complete and leave less deposits behind in normal riding. A 10-micron water-separating fuel filter between the fuel tank and the engine will keep water and contaminants out of the engine. Re: 87 octane with ethanol or 91 octane without... 1994 Merc 75hp 2 stroke Dude -- you are in Minnesota as I am. Riding at the rpm limits, you'll need higher octane. The engine structure is relatively simple and maintenance is exceedingly easy. There is also zero more power potential in 93 than 87. 2 strokes can get away with lower octane because of the oil in the premix keeping the engine running cooler. The two stroke outboards are lightweight and compact yet deliver high power output. Johnson & Evinrude Outboards . Although we have lineup of four strokes, we also offer an extensive two stroke lineup to meet diverse global needs. All of the yamahas are made to burn up to 10% ethanol. Dose the fuel with a carbon-cleaning additive or fill the tank with 89-octane … If the engine is not designed to run 91 it will only build carbon. Being that most fuel stations only carry 87 octane that is the closest you can get. Across the range you’ll find an array of features that help keep your boating experiences more enjoyable and trouble-free. 91 octane unleaded is the best for most domestic outboards and garden tools. Two Stroke Octane... Thread starter guitarplaya39 ... Two Stroke Octane... Thread starter guitarplaya39; Start date Apr 23, 2019; G. guitarplaya39 Cadet. Joined Apr 14, 2019 Messages 16. Ethanol is not the demon fuel the uninformed tend to make it. Apr 23, 2019 #1 I've already posted a couple questions about my (new to me) 1975 Evinrude 115. Mercury® TwoStroke Outboards. You run SeaFoam so the fuel system is protected. Running high octane fuels in an engine designed for low octane fuel can result in incomplete combustion causing excessive carbon and a waste of money. I was advised to (1)stay away from the "cheapie" gas as found at the local convenience store and only use a "name brand" gas such as Chevron, Texaco etc. If it was so terrible the ditches would be littered with discarded outboards. The outboards have low compression ratios so they can be used safely in third world country fuels, eg one outboard suits all the world markets.

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