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Anyone who owns, or has owned, a two stroke outboard would have asked us the question; how much oil perform I mix v my fuel? 100:1, 50:1 or 25:1?It is just one of the many asked questions for those compelled to pre-mix their oil and also fuel together. Listed below I have listed the oil ratios reubraintv-jp.commended by manufacturers and also a few tips based upon my experience.

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100:1 - Mix 50ml that oil per 5ltrs that fuel. Reubraintv-jp.commended by Yamaha and Suzuki for many of their small two hit engines up to about 30hp, this proportion requires the least amount that TCW3 2 stroke oil. The an outcome of making use of this proportion (less oil) is lessened spark plug fouling and also less smoke.For older Suzuki outboards, pre-1997, I"d reubraintv-jp.commend running 50:1 as the info I"ve noted about is for current model 2 strokes.Note: because that ubraintv-jp.commercial applications Suzuki reubraintv-jp.commends 50:1.50:1 - Mix 100ml of oil every 5ltrs that fuel.Reubraintv-jp.commended through Mercury, Mariner, Tohatsu, Johnson and also Evinrude this is my preferred ratio for every outboards including Yamaha and also Suzuki. You deserve to confidently use this proportion for any type of horse power and just around all year models. Whilst this ratio can see spark plugs fouling with expanded use at lower RPM (such together trolling), in mine opinion, it offers the finest amount the lubrication for your outboard.25:1 - Mix 200ml the oil per 5ltrs that fuel.This mixture is very rich and is normally reubraintv-jp.commended for running in brand new two punch outboards and when to run in rebuilt or reconditioned engines.If you have actually a rebuilt or reconditioned oil injected 2 stroke outboard (excluding Evinrude ETEC or Mercury Optimax) then you"ll simply need to include 50:1 to your fuel and let the oil injection system add the rest of the oil to make up the balance to gain to 25:1.Most technicians will have their own opinion or check out on how long you should run the 25:1 ratio for but, I constantly reubraintv-jp.commend between 8 and 10 hours. Unfortunately, you will certainly foul plugs at this ratio and leave a very impressive exhilaration plume on engine begin up but, outboards that have actually been rebuilt or reconditioned need this extra oil while the piston ring bed right into the bores.Oil ratios have the right to be confusing and also daunting. The last thing anyone wants to carry out is not use sufficient oil and damage their pride and also joy.Hopefully, the above answers any type of questions you may have and gives friend a far better understanding of what ratio your outboard requires.Shop because that Penriteoutboard oils & lubricants here.

ubraintv-jp.comments (7)


We blended 25:1 because that old 70hp evenrude motor ran ok. ~ above trailer reved alright and ideld ok however on water motor retained dieing and also cutting the end when starting to load power up can this trouble just it is in too lot oil mixOutboard Spares Response Hi,This could be a number of issues such together faulty fuel pump, carburetors needing cleaning, ignition issue, etc. I think running 25:1 will not be the problem with this engine.
Hi males please assist. I have these 2 motors however do not know the fuel mixture as part old little motors use to operation a 100:1 ratios where as many are 50:1. Just how will i know. I also do know that totally synthetic has actually its very own mixture prefer 75:1.

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Outboard Spares Response Hi,If i owned one of these engines I'd be running 50:1 v a decent TCW3 2 hit engine oil designed for pre-mix. If you're act a the majority of idling and also slow trolling you can reduce the proportion a little bit if you discovered you space fouling plugs however honestly ns think 50:1 must be fine.Cheers
A an excellent Rule Of thumb on 2 hit oilsmall engines = much less oil 100-1 / 50-1Engines prior to 2000 and also beyond huge or tiny 50-1new engines 25-1 / 20 come 40 liters
Are friend able to usage the very same oil together for aircooled engines such together chainsaws etcOutboard Spares Response Hmmm. Great question. Outboard oils room designed for water-cooled engines. I would certainly not suggest it. Cheers
Is the claimed ratios required for big hp 2 strokes . Year 2000 front . As most are oil injected anyway .What's the reason for adding oil to the fuel mix if the engine is to run fine . No rebuild ect . Dose it save oil gift injected .Outboard Spares Response If her outboard is oil injected, and hasn't to be rebuilt, then you won't need to include any oil to her fuel. But including oil to her fuel will certainly not readjust the lot injected by the engines oil injection system.
Simple divide 1000ml or 1 litre that petrol by proportion = the required amount the oil per litre the fueli.e 1000 / 50:1 = 20ml the oil every litre the fuelOr I.e 1000 ml of petrol divide by 100:1= 10mls that oil every litre