94 25hp johnson sputter after 1/2 throttle

cooperjd

Cadet
Joined
Mar 25, 2006
Messages
8
today my outboard was running fine, and all of a sudden, like i hit a brick wall, it stopped running fine... all of a sudden, at full throttle, it just stopped, sputtered, and almost died. it ran ok at idle, and just a little past. but when i turned the throttle up, it just sputtered and jumped. it has new spark plugs, and has given me no trouble so far this year. i used seafoam spray to clean the carb, and let it idle for a while, cut it off, sprayed it again, let it soak, then ran it again (did this twice). i ran it in the backyard with a garbage can full of water, so i really coulnd't run it in gear, as the water would come out.<br />oh yeah, in neutral it will idle up to full throttle, but not when in gear. any ideas? i will give you more info if i can. i'm not a mechanic, but i love to tinker. i also do not have a manual, so i probably need to get one. thanks.
 

ob

Admiral
Joined
Aug 16, 2002
Messages
6,992
Re: 94 25hp johnson sputter after 1/2 throttle

Could be several things.Fouled carburetor/s,failing fuel pump,fuel hose leaks,losing spark etc..<br /><br />Try pumping the primer bulb while running and see if the engine picks up.This could narrow down a fuel pump or air leak.Also check the fuel connections for leaks and tank pickup tube for restriction.Just a few things.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 94 25hp johnson sputter after 1/2 throttle

are you running new gas. if it is last years gas, it may have water in it. follow your fuel line on the engine, should be a filter where if connect to the block.
 

cooperjd

Cadet
Joined
Mar 25, 2006
Messages
8
Re: 94 25hp johnson sputter after 1/2 throttle

its new gas, and priming the bulb does nothing. i'll try and get apart the fuel pump housing and look for a filter. since it happened so suddenly, like mid-river at full throttle, i'm inclined to think (and hope) its a clogged line or carb or something somewhere. thanks for the replies
 
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