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Old 26 July 2014, 13:04   #1
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Tohatsu 9.8 2 stroke first time out this year

I bought a used Tohatsu a few months ago ,not used this year,should the first 12 liters of fuel be mixed at 25 to 1 as in the manual or just use 50 to 1 all the time.
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Old 26 July 2014, 14:43   #2
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I would also be interested in the forums expert knowledge on this.
As yourself I read this in the manual so to be on the safe side I just mixed up a couple of litres at 25:1, ran it for 20 mins in tank, discarded left over fuel, and used new fuel at 50:1 when next on the water. My engine will probably only get used once a month so always use new fuel mix with stabiliser added.

Cracking little engine though, so light and surprisingly quick with only me on board.
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Old 26 July 2014, 14:56   #3
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If the engine was previously run in and using a 50:1 Mix then continue using that. 25:1 is for the first 10 hours only.
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Old 26 July 2014, 14:57   #4
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If I mix 12 litres it might last me 2 or 3 trips,possibly the year,not been out yet so not sure how long a tank will last.I don`t suppose a bit extra oil will matter.Next problem will be getting the fuel to the launching site 70-80 miles by car do i fill the fuel tank first or carry in large can,fumes will be the biggest problem,
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Old 26 July 2014, 15:02   #5
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Willk, So I can ignore what it says in the manual after winter storage and go 50-1 all the time.
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Old 26 July 2014, 15:04   #6
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Quote:
Originally Posted by chrissd330 View Post
If I mix 12 litres it might last me 2 or 3 trips,possibly the year,not been out yet so not sure how long a tank will last.I don`t suppose a bit extra oil will matter.Next problem will be getting the fuel to the launching site 70-80 miles by car do i fill the fuel tank first or carry in large can,fumes will be the biggest problem,
Don't mix it if you don't need it! I use a garden style 5L can to buy fresh fuel in and I mix it just before I need it, adding it to whatever is in the main 12L tank. The 12L tank will basically last you all day - the motor does 4.5L/hr at WOT, much less at lower revs. If you close the vent on the fuel can and disconnect the fuel line, you shouldn't have any fumes.
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Old 26 July 2014, 15:13   #7
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Thanks Willk,I shall keep the fuel tank full and keep topping up with my 5 litre can mixing it the day i use it,I keep a can for my lawn mower.
Thats good news about 12 litres lasting all day and 4.5 l an hour,and no fumes can`t wait to get off.
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Old 27 July 2014, 22:56   #8
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One other thing you can do as a fume reducer is to take a piece of polythene and a couple of rubber bands. Just before you put all the gear back into the car, place the poly over the engine connector and wrap the rubber band around the poly. I have done this for years and found it helps. A bit heath robinson perhaps but as Tesco says ' every little helps '.

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Old 28 July 2014, 04:07   #9
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Thanks Willk,I shall keep the fuel tank full and keep topping up with my 5 litre can mixing it the day i use it,I keep a can for my lawn mower.
Thats good news about 12 litres lasting all day and 4.5 l an hour,and no fumes can`t wait to get off.
I hope you are not going to be using the same 2st mix as your lawnmower, as they will require different 2st oil as outboards do not run as hot as garden mashinery!
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Old 28 July 2014, 05:11   #10
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I've never found 12 litres lasts all day (how is all day 2-3 hours?) but I keep reading that everyone else's does!?

My Tohatsu 9.8 was not as thirsty as my Mariner 15 but in general use (ie not constant WOT) I average around 2 to 2.3 NM per litre or 8 litres an hour or so which is more than the old 10% of hp in gallons per hour (ie 6.75 for a 15). I've found that guide a bit optimistic.
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