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Outboard fuel mixture is it 25.1or50.1 in my 18hp tohatsu

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Posted on Jan 02, 2017

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SOURCE: fuel oil mixture for 1986 mercury 115

I own a small Mercury outboard so I did alittle reading in the manual and the ratio for your 86' 115 HP is 50-1. Hope it helps. Coach Theune

Posted on Oct 25, 2009

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SOURCE: fuel mixture for an Evinrude 1963 5 1/2 Fisherman

50 to 1

Posted on Apr 25, 2010

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SOURCE: i need a free workshop manual for tohatsu outboard

how can i get service manual for a tohatus m40c 1992?

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9.8HP 4 stroke engine cuts out when accelerating about 25 %

That sounds like fuel starvation. Check the fuel lines for kinks or pinches and make sure you have the fuel tank vented. Slacken off the cap, and run it, that will prove if it is a venting problem. Also make sure the priming bulb is installed the right way round. The arrow should be pointing to the engine.

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one would assume so but as you have not mention if it is a 2 stroke or 4 stroke , that assumption would possibly be wrong
2 strokes use reed valves between the carby and manifold and the crankcase and in outboards these reed valves can split and not function properly especially at higher prms
these reed valves allow fuel mixture in when the piston goes up and shut off when the piston comes down creating a pressure in the crankcase which pushes the mixture up the bypass of the cylinder into the combustion chamber
if these reed valves are not working properly or the crankshaft seal are failed this compression in the sump doesn't occur properly and engine running problems result
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have the ignition system checked as it may be an overheating component ( coil --ignition module) that is causing the failure.

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What year is Tohatsu M15B2 serial number 351A33838 outboard


You can contact Tohatsu directly using the form provided at the link below.

Hope this helps,

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Cheers, Timo

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2 Answers

Fuel oil mixture for 1986 mercury 115

I own a small Mercury outboard so I did alittle reading in the manual and the ratio for your 86' 115 HP is 50-1. Hope it helps. Coach Theune

Oct 25, 2009 | Boating

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