Too lean is too bad. A 40:1 mix oil should only be mixed at 40:1 and a 50:1 mix oil (such as Stihl oil) should only be diluted at 50:1. the 50:1 mix you have already has too little oil for the chainsaw. Different engines use different ratios of gasoline to oil, ranging from 20 parts gasoline to 1 part oil, or "20:1," up to "50:1" or more. STA-BIL (22403) Full Synthetic 2-Cycle Oil - With Fuel Stabilizer - Makes 1 Gallon - 50:1 And 40:1 Mix Ratios - Low Smoke Formula - Ethanol Protection, 2.6 fl. A 40 hp Mariner outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel. Two-stroke engines derive lubrication from the oil mixed directly into the gasoline, unlike your car engine, which lubricates itself with oil housed in an oil sump and circulated by an oil pump. If you own a mild-mannered bike, consider a 50:1 ratio. I use 40:1 in everything and personally would not use any less oil than that. For a trail bike, 40:1 would be the way to go, assuming that you used a quality oil. The boats are all labled for 50:1 but i run 40:1, every now and then i go to 50:1 and cant tell a difference. I have been using closer to 40:1, thinking more oil is better. Full size - printable graphs Fuel/Oil graph 25:1 to 50:1 Very complicated to figure out how to mix 50:1 two cycle gas with oil. Easily calculate the appropriate premix for a 2 stroke engine with this gas oil mix ratio calculator. SXIPro I run every thing at 40:1. You will either under oil your mix or over oil your mix. A graph is helpful for 'what if questions'. Add the correct amount of gasoline. - Using more two-stroke oil (i.e., 40:1 vs 50:1) will not help your engine. Ratio 20:1 25: 1 30:1 32:1 35:1 37:1 40: 1 45: I 50:1 55: 1 60:1 United Fluid Ounces Per Gallon 6.4 4.3 3.7 3.5 3.2 2.8 2.6 2.3 States/Metric I have two other motors that run 50/1 so one lot of mix does the three. Premixed for outdoor power equipment – TruFuel provides the perfect fuel for all 2-cycle 50 to 1 oil mix or 40:1 or for 4 cycle engines; To use in 2-cycle or 4 cycle engines; Suitable for portable gas-powered equipment; Ethanol-free and high-octane fuel with an added stabilizer that reduces engine wear for a longer life; Stable and long-lasting Well thats premix boats i forgot i have one boat with oil injection on it. If 40:1 makes you sleep better, so be it. drawn from 40 to 1 mix . Add this amount of oil to the backpack blower gas tank and pour in the 50:1 trufuel and give the blower a shake. Re: 100/1 or 50/1 oil mix The more i think about it, the more i like the idea of the 50/1 mix. Its run at whatever the thing tells it based on rpms. is 40:1 better? Mix the gasoline and oil. The chart below can help you figure out the correct measurements to use. oz. 40:1 Mix Jason Walter 2019-03-08T15:26:01+00:00. Mixing Gas+oil, 40 to 1 by ajchatel on 04/24/02 at 19:16:59 I have a small Gas powered Weedeater, that I have to mix the gas and oil, at a ratio of 40 to 1. My STIHL BR600 backpack blower with the 4-Mix engine calls for a 50:1 oil mix. So. Step 1. Stir or shake the container to mix the oil and gas. Note: Never mix fuel in an enclosed space. gasoline add 16 oz oil total 656 oz mixture. A graph is easy to read. 4.7 out of … In the 70s/80s, the two stroke oil was not as good as it is now, in those days a 25:1 mix would have been the done thing, with modern oils they specify 50:1 but personally use 40:1 to ensure that an air leak or weak mixture at the top end will not mess the engine up too much. . Use our 50 to 1 fuel mix calculator to work out how much oil you need to make a 50:1 two stroke ratio. i don't know how you plan to mix what amounts. Use the same type of container designed for gasoline storage, measure correctly and mix the fuel completely before filling your chain saw. 32:1, 40:1 and 50:1) and the AMSOIL SABER Ratio™ (100:1). is precision-engineered with proprietary lubricants and advanced stabilizers to provide maximum protection to your 2-cycle engines. Never ever get and oil which states a recommended dilution ratio on the bottle and dilute it at any other ratio. Now if the 32:1 mix was older and the 50:1 is newer fuel, that could make a difference. . (You’ll find out more on how to mix these ratios later in this guide.) Oil ratio graphs. As for oil mix ratios, I have always ran 50:1 even on a highly modified jetworks setup but too much is better than to little (obviously!). 2-Stroke Oil Mix Calculator. Started with 640 oz ( 5 gal.) Check your warranty manual for the correct 2 stroke oil ratio for your Husqvarna equipment. Ok I have a chainsaw and a weedwhacker that call for 50:1 mix and another weedwhacker which calls for a 40:1 mix. TC-W3 is leaps ahead of what was available back in 1960, and will protect a lot better, even with a leaner mixture. Other engines use "premix," in which the oil and gas are mixed together prior to being put in the gas tank. Always perform these steps in a well-ventilated area. As a general guide, a 50:1 gas-to-oil ratio equates to 1 gallon of gasoline to 2.6 fluid ounces of engine oil; similarly, 2.5 gallons of gasoline will require 6.4 fluid ounces of oil. I would think those older small engines, like the Scott, spec'd 40:1 because of the oil technology at the time. If you are treating 1 gallon of clean unleaded gasoline, a 50:1 ration translates to 2.5 ounces of two-cycle oil, while preparing a 40:1 blend calls for 3 ounces of oil. 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