no wot

lostinboat

lostinboat

Seaman
Joined
Oct 18, 2008
Messages
63
1983 90hp seahorse, was running great then had a no start. turned out to be a bad wirein the harness. since then to wot, will run smooth and nice to half throttle but once you try to go full throttle just boggs down. checked compression 1-90 2-100 3-100 4-95 any overhauled carbs,decarboned with seafoam. no change. any help???? thanks
 
lyncraft_mechanic

lyncraft_mechanic

Petty Officer 1st Class
Joined
Jun 22, 2007
Messages
233
Re: no wot

have you tested your spark on each cylinder? you can purchase a spark tester at your local automotive parts store at a reasonable price. if the spark checks out i would think it is starving for fuel or you may even have a bad fuel line, sucking air. have you tried to pump the primer bulb on the fuel line when it starts to loose power? next time you take it out bring a friend along and have them pump the primer bulb and see if the engine picks up RPMs, if it does i would suspect the fuel pump!
 
lostinboat

lostinboat

Seaman
Joined
Oct 18, 2008
Messages
63
Re: no wot

have pump bulb and no change. have checked spark and found spark to all plugs. have noticed plugs 1 and 3 are wet and 2 and 4 are dry. am beginning to think my have bad power head gasket... any help or thoughts, thanks
 
tashasdaddy

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: no wot

check compression, when were the carbs last cleaned and rebuilt?
 
lostinboat

lostinboat

Seaman
Joined
Oct 18, 2008
Messages
63
Re: no wot

carb's rebuilt 5 days ago. just rechecked commpression and #1 cyl is now only 70 psi.#2 cyl is 100psi ,#3 is 100 psi #4 is 105 psi. i am planning on taking it to the repair shop in the a.m. Will post finding. thanks for the help
 
lostinboat

lostinboat

Seaman
Joined
Oct 18, 2008
Messages
63
Re: no wot

took boat to shop. finally after a couple hours found bad wire from power pack to #3 cyl coil. wire was shorting causing # 3 cyl to misfire and engine to lose power under load. engine now runs better than ever. many thanks to all who helped with this problem.
:)
 
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