1974 mercury 500 50hp

jamie_123

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May 14, 2013
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thanks in advance guys first post on the site im working on this boat for a friend it has sat for a few years so i rebuilt the carbs and put new primer bulb and line we took it for a drive yesterday it ran decent but is only half power at wot but out of the blue and sometimes when you hit a series of waves BOOM you get max power and it planes out will stay there until you throttle back down then same thing half power and its a wating game till you get power back thought the trottle may be sticking but took the covers off and the butterflies are fully open this has got me stumped havent checked fuel pump yet thanks for any advice.
 

jamie_123

Recruit
Joined
May 14, 2013
Messages
3
Re: 1974 mercury 500 50hp

ran it on the muffs for a while found if I raised the throttle some it would pick up some rpm but if I squeezed the primer bulb it picked up a lot more. diaphragm in the fuel pump is good?
 
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