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Old 27 August 2009, 10:33   #1
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Problems with Tohatsu 50hp

I have a (roughly 2005/6) 2 stroke 50hp.
Took it out today for the first time in about 2 months and run okay. Went out for 15-20mins and then lost nearly all the power and the engine died. Obviously restarted a couple of times and reved niced and high then everytime i put it into gear i could only get very low rpm and power.
Then after a few times lost power all together.
I usually put a rag in the back to soak the water up but forgot today and it was pretty rough. So i put it down to water and ran the usaual checks for water in the carbs etc etc none was found.
Anyway got it back on land and it ran right up to high rpm even in gear then after a few seconds/minutes died. Check the spark plugs which seem okay could get a few more runs out of them. As i say no water in the carbs and decided id take her home to be looked at.

Got home and she runs but will only start on very little throttle and choke and wants to die at first i kept her running by opening up a little but after a while opening the throttle killed it quicker.

Anyone who can give me a list of things to check would be much appreciated.
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Old 27 August 2009, 12:40   #2
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Fuel starvation?
Check all your hoses, and tank vent etc.
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Old 27 August 2009, 13:45   #3
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Fuel starvation?
Check all your hoses, and tank vent etc.
Fuel through the primer, filter and carbs so thats not a problem.
Someone has suggested the bottom fuel pump may have gone, got to check a couple more things first.
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Old 27 August 2009, 13:57   #4
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Bottom fuel pump?
the diapragm may have split, think the pump is on the port side, near the tray.
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Old 27 August 2009, 14:19   #5
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Bottom fuel pump?
the diapragm may have split, think the pump is on the port side, near the tray.
Thats exactly what they said.
Ive checked all the plugs and the bottom one seems no wetter than the other two cylinders. Apparently this would be a sign of the fuel pump being buggered.
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Old 27 August 2009, 14:22   #6
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Try running it while pumping the primer bulb. This will effectively take over from the fuel pump. If it runs ok when you do this, then the fuel pump may well be faulty.
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Old 27 August 2009, 14:29   #7
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Try running it while pumping the primer bulb. This will effectively take over from the fuel pump. If it runs ok when you do this, then the fuel pump may well be faulty.
Nice one ill try this in the morning the neighbours wont appreciate me running it now with them having a kid and all!
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Old 27 August 2009, 14:47   #8
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pop the cover off the pump, the diapragm is easily checked.
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Old 27 August 2009, 14:50   #9
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pop the cover off the pump, the diapragm is easily checked.
I pressume it will be easily noticeable and cause a suction leak right?
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Old 27 August 2009, 15:06   #10
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the damage will be easily noticed, ie ripped or holed...
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