mercury classic 50 (45 horsepower) 1985 4 cyl

by Ryan Kurr
(Annndale, Mn)

motor runs great at idle and reving up. Motor runs great when first taking off then not long after it bogs down . it won't shut off but most all power is lost can only go at slow throttle once in awhile I will slowly advance the throttle and I can gain speed and power only bog back down shortly after. Ive had the carburetors apart and cleaned them. they were not very dirty the sediment bowl had hardly any dirt in it. all were 115-120. But not sure if I did it properly . I tested them with no prestarting the motor.or warming it up. I have cleaned out the gas tank but have not ran it yet.
Anyone care to put there advice in is welcomed and appreciated .
thank you
Ryan

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Jun 30, 2021
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by: Anonymous

BTW if you rebuilt the carb make sure the float is set right and working properly. I always check by holding the carb upside down and blow into the cockpit fuel line. if the cab is working it should shut off and you cant blow into it. The level of the float is "rule of thumb" 90 degrees but double check. FYI do not use silicone to seal up anything on the carb especially the bowl.
Jun 30, 2021
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by: Anonymous

Hi, It sounds to me like the fuel pump is not keeping the carb full of fuel. You might rebuild or replace it but also check the hole in the engine that gives the fuel pump Vacuum and pressure It could be clogged.

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