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Old 18 July 2018, 04:26   #1
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Country: Denmark
Length: 7m +
Join Date: Jul 2018
Posts: 2
Yamaha 150 2 stroke problems - Please help

Hi RibNet.
I have a Tornado 7m mountet with an older Yamaha 150 ceto 6g4
The motor is running fine at 4700 rpm - 32 knt but when I get out of the harbour and hit the waves the motor loses power and rpm - 3500 rpm 15 knt?
I have changed the entire fuelline, sparkplugs, controlled the timing and drained the carbs and the motor was running fine until I hit the waves again???
Once again I drained the carbs and the motor was running fine again..

Do anyone have an idea to awoid the powerlos??
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Old 18 July 2018, 05:10   #2
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Country: UK - England
Town: Cheltenham
Boat name: Mavi Su
Make: Cobra Nautique 6.6
Length: 6m +
Engine: 150
MMSI: 235114058
Join Date: Oct 2011
Posts: 198
RIBase
There is a very similar thread here:-
Yamaha 150hp Engine help
some are suggesting the fuel pickup in you hand is getting blocked by contaminates in the tank.
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Old 18 July 2018, 05:25   #3
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Country: Denmark
Length: 7m +
Join Date: Jul 2018
Posts: 2
Im aware of that similar thread.
I have cleaned the fueltank and the primer is hard when running.
Just a second before the powerloss is comming up, the motor is running up in RPM, at the first time i had the feeling that the propeller was out of the water but it wasnt
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