I have a problem with my 50 HP 2 stoke Mercury. I will be running along at about 4800 rpm and with out warning, the rpm will drop to 3500 rpm at full throttle. I put the boat in neutral and rev it up to red line 5,000 rpm for a second, go back to an idle and then put it in gear slowly throw the throttle and will still only get 3500 rpm out of it at full throttle.The bulb also gets soft sometimes

 

Then for no reason, it may or may not clear up and run right. I have had two so called Mercury mechanics look at it, I spent over $1,400.00 on it and had all the carburetors and fuel pump rebuilt, installed all new fuel lines, added a water separator, new filters, new prop and water pump, new vented gas cap, new plugs, and both mechanics claimed it was fixed, which it is not. It also idles rough and stalls which makes parking a problem. It has a non metallic fuel cell Any ideas or who could fix this?

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Has anyone check to see if the timing advances, If you have replaced all fuel related systems and still have a problem then I would see if your timing is advancing or if there is something wrong in ignition system. I recently graduated from MMI and would gladly take a look if you would like. 321-557-4162 call me.

what kind of gas are you using?  when was the last time you had a water pump service?

 

You can get a free est. at Boathouse Discount Marine. I took my boat there and they have it togeather. They are great :)

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