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Old 25 May 2023, 18:52   #1
Country: UK - Scotland
Town: Edinburgh
Length: 4m +
Join Date: May 2023
Posts: 28
Tohatsu M18E2

Hi all, Iíve got an Tohatsu 18hp 2stroke outboard that when tested in the water would die at high revs.
Iíve fitted new plugs, new fuel and stripped and given the carbs a good clean.
I found the mixture screw was excessively turned out (by previous owner) so have tried to reset it while running the outboard in a large bucket of water, listening to it carefully and using my tachometer to help find the highest idle, then adjusting the idle screw to set the revs. It seems to be running fine now with the mixture screw at 2 turns out, but not yet had a chance to take the boat out and test it in the water.

I was just wondering if anyone has experience with this outboard and knows what the correct setting should be for the mixture screw? I have the manual, but thereís no mention of it in there.

Like Iíve said, it does sound ok now, but just looking for a bit advice to see how close I am to the recommended setting before hitting the water (to put my mind at ease lol)

Any help would be much appreciated.

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Old 03 June 2023, 14:26   #2
Country: Sweden
Town: Falun
Make: Zodiac Futura Mk 2c
Length: 3m +
Engine: Suzuki DF20A
Join Date: Aug 2021
Posts: 127
I had one of those engines. Very good engine! Unfortunately I don't know the idle screw setting, but if it dies at high revs I would check the fuel pump and try to manually pump the primer bulb when running to see if that makes a difference.

I had the same problem on another outboard. Turns out it was missing the center, top gasket in the float bowl in the carburettor. So the carb was leaking inside.
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Old 03 June 2023, 19:00   #3
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Country: UK - England
Town: Cambridgeshire
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Yam 15 Tohatsu 9.8
Join Date: Nov 2007
Posts: 8,579
I often set the mixture screw by screwing in until revs start to reduce... then screwing out to the same effect... then set halfway between the two plus 1/4 turn out. You should be setting an idle of about 700rpm with the prop in water and in gear.
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