Mercury 50 HP Cuts out at WOT.

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yoda439

Recruit
Joined
Jul 13, 2005
Messages
5
1984 Mercury 50 HP #6539486.Starts and idles fine.But when pushed to WOT it starts to increase but just bogs and after about 1-2 min.it dies but starts back up ok.Top speed is only about 6 mph.Ran comp check=120 on all 4 cyl.Check gas filter in screw cansiter seemed white and clean.Top carb has WMA3-1 and bottom carb has WMA3-3.Fuel pumps is on the side of carb and is square.Are these the right carbs and year 1984 on title? Tried pumping bulb at WOT no help thanks.Tried new port.fuel tank and same.Plese help! Plugs= NGK BUHW
 
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yoda439

Recruit
Joined
Jul 13, 2005
Messages
5
Re: Mercury 50 HP Cuts out at WOT.

Found two yellow wires from stator and covering was falling off them as if overheated and one terminal was melted to rect.terminal.Removed flywheel and replaced bad yellow wires from stator.also found bottom rect. nut loose and tighened it.Have manual and tested per Rx settings on rect which showed bad.Test on stator was ok except no cont. tested showed about half scale.I will replace the stator and rect.could this have been the no wot problem? Thanks
 
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Laotzu

Petty Officer 2nd Class
Joined
Aug 1, 2004
Messages
150
Re: Mercury 50 HP Cuts out at WOT.

Have you tested stator output with a DVA meter? How about DC voltage while running? S/B around 14.5. Even if the rectifier is blown, it will run off the battery for a while.<br /><br />Jerry
 
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Laotzu

Petty Officer 2nd Class
Joined
Aug 1, 2004
Messages
150
Re: Mercury 50 HP Cuts out at WOT.

I'd be absolutely certain that replacing any parts will solve the problem. Otherwise your heading down a slippery slope. Read "stator or rectifier for charging problems" by Okeyo a few topics up. I can say this because I've been down the slope.<br /><br />Jerry
 
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