Anyone who owns, or has owned, a two stroke outboard would have asked us the question; how much oil do I mix with my fuel? 100:1, 50:1 or 25:1?It is one of the many asked questions for those required to pre-mix their oil and fuel together. Listed below I have detailed the oil ratios redearteassociazione.orgmended by manufacturers and a few tips based upon my experience.

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100:1 - Mix 50ml the oil per 5ltrs of fuel. Redearteassociazione.orgmended by Yamaha and also Suzuki for most of their small two punch engines up to around 30hp, this ratio requires the the very least amount that TCW3 2 stroke oil. The result of utilizing this ratio (less oil) is reduced spark plug fouling and also less smoke.For larger Suzuki outboards, pre-1997, I"d redearteassociazione.orgmend to run 50:1 as the information I"ve detailed about is for present model 2 strokes.Note: because that dearteassociazione.orgmercial applications Suzuki redearteassociazione.orgmends 50:1.50:1 - Mix 100ml that oil per 5ltrs of fuel.Redearteassociazione.orgmended by Mercury, Mariner, Tohatsu, Johnson and also Evinrude this is my desired ratio for every outboards including Yamaha and Suzuki. You have the right to confidently use this ratio for any kind of horse power and also just about all year models. Whilst this ratio could see spark plugs fouling with expanded use at lower RPM (such together trolling), in my opinion, it gives the ideal amount that lubrication for your outboard.25:1 - Mix 200ml the oil per 5ltrs the fuel.This mixture is very rich and is typically redearteassociazione.orgmended for to run in brand new two punch outboards and also when to run in rebuilt or reconditioned engines.If you have a rebuilt or reconditioned oil injected two stroke outboard (excluding Evinrude ETEC or Mercury Optimax) then you"ll simply need to add 50:1 to your fuel and also let the oil injection system add the remainder of the oil to consist of the balance to gain to 25:1.Most technicians will have their own opinion or watch on just how long you must run the 25:1 ratio for but, I constantly redearteassociazione.orgmend in between 8 and also 10 hours. Unfortunately, you will certainly foul plugs at this ratio and also leave a really impressive smoke plume ~ above engine begin up but, outboards that have actually been rebuilt or reconditioned require this extra oil while the piston ring bed right into the bores.Oil ratios deserve to be confusing and daunting. The last thing anyone desires to execute is not use sufficient oil and damage your pride and joy.Hopefully, the over answers any questions you may have and also gives you a far better understanding of what ratio your outboard requires.Shop because that Penriteoutboard oils & lubricants here.

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We mixed 25:1 for old 70hp evenrude engine ran ok. ~ above trailer reved alright and also ideld ok yet on water motor maintained dieing and also cutting the end when beginning to load power up might this difficulty just it is in too much oil mixOutboard Spares Response Hi,This could be a variety of issues such together faulty fuel pump, carburetors needing cleaning, ignition issue, etc. Ns think to run 25:1 will not it is in the concern with this engine.
Hi males please assist. I have these two motors however do not recognize the fuel mixture as some old tiny motors use to operation a 100:1 ratios whereby as many are 50:1. How will ns know. I also do recognize that totally synthetic has actually its own mixture prefer 75:1.

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Outboard Spares Response Hi,If ns owned among these engines I'd be running 50:1 through a decent TCW3 2 punch engine oil designed because that pre-mix. If you're doing a most idling and slow trolling you might reduce the ratio a little if you uncovered you space fouling plugs but honestly ns think 50:1 should be fine.Cheers
A good Rule Of thumb on 2 hit oilsmall engines = less oil 100-1 / 50-1Engines before 2000 and also beyond large or little 50-1new engines 25-1 / 20 dearteassociazione.orge 40 liters
Are friend able to use the very same oil together for aircooled engines such together chainsaws etcOutboard Spares Response Hmmm. An excellent question. Outboard oils space designed for water-cooled engines. I would certainly not suggest it. Cheers
Is the stated ratios essential for huge hp 2 strokes . Year 2000 front . As most are oil injected still .What's the factor for including oil dearteassociazione.orge the fuel mix if the motor is running fine . No rebuild ect . Sheep it conserve oil gift injected .Outboard Spares Response If her outboard is oil injected, and hasn't been rebuilt, then you won't need to add any oil to her fuel. But adding oil to her fuel will not readjust the quantity injected through the engines oil injection system.
Simple division 1000ml or 1 litre of petrol by ratio = the forced amount the oil per litre of fueli.e 1000 / 50:1 = 20ml of oil per litre the fuelOr I.e 1000 ml that petrol division by 100:1= 10mls of oil every litre