1998 mercury 9ohp carb engine want run full throttle

mikep6

Cadet
Joined
Jun 15, 2010
Messages
17
:(when you take off full throttle boat takes out good until it hits a certin rpm like 4300 thenits like a dead spot will drop rpm let off throttle a little and will pick up a little not much will run all day half throttle but bogs down if you go over and still run half throttle doesent try to die.
changed

stator,trigger,all three coils,plug wires,cdi box,plugs,every thing i could think of electrical,cleaned carbs,put new jets in,reeds looked good,new fuel filter,spent a lot of money at the marine and they couldnt figure it out help please oh yea compression is 125 to 127# thanks
 

Barnacle_Bill

Admiral
Joined
Feb 8, 2004
Messages
6,469
Re: 1998 mercury 9ohp carb engine want run full throttle

Has the fuel pump been rebuilt using the new style check valves? Merc includes them with there kits. I don't know if the other vendors do or not.
 
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