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

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