Hello everyone. This is the first time i have ever posted on a forum in search of repair help. So bare with me! I will do my best to give you as many details as possible... Now, on to the motor!
Not to long ago a purchased a '78 Johnson 55hp outboard. It ran great and had been serviced prior to my purchase (on water hose). I was not able to water test it because it wasn't on a boat. But, everything seemed fine with it. Well, i got it rigged up on my boat, and put it in the water to test it, and it did fine other than it idled much lower, to the point it would die pretty quickly after putting it in neutral. I thought, no big deal, i'll just turn up the idle. Well, that didn't help. I've turned it up several times actually with little difference. But the main problem i'm having is, is that once i get the boat in the water and get the engine warmed up, it wants to die as soon as i start to give it throttle and get going. It seems to me like it's flooding/getting too much fuel, but i don't know for sure. It's very frustrating. Most of the time i have to slam the throttle to get past that stutter/die point, and it will stutter a little and get going. But not EVERY time... The motor does run fine on the top end. Pushes boat real nicely. But i'm just sick of it dying on me. I have to use the choke every single time i turn the key also. And i also have to use the warm up lever, even after the motor is warm. What is the deal? Here are some details about the motor:
New CDI/Power Pack
New water pump
New spark plugs
updated wiring harness
cleaned carbs (these do NOT have the adjustment valves)
coils are original to motor but work fine (i think)
Compression: TOP = 130 psi • BOTTOM = 115 psi (is this too far off?)
fuel line is new, gas tank is new
screen on fuel pump is clear
fuel pump is original
foot oil changed
engine oil = quicksilver pre mix, 50:1
Below are pics of the motor and the spark plugs. The left plug is from the bottom piston. As you can see it is darker than the top plug. I will also attach a link to a video of it running on a hose. So now i ask, how can i fix the problem of it dying every time i try to get going? Thanks!
video: https://www.dropbox.com/s/zhjyjunh6a5gp5p/20150719_095651.mp4?dl=0
Not to long ago a purchased a '78 Johnson 55hp outboard. It ran great and had been serviced prior to my purchase (on water hose). I was not able to water test it because it wasn't on a boat. But, everything seemed fine with it. Well, i got it rigged up on my boat, and put it in the water to test it, and it did fine other than it idled much lower, to the point it would die pretty quickly after putting it in neutral. I thought, no big deal, i'll just turn up the idle. Well, that didn't help. I've turned it up several times actually with little difference. But the main problem i'm having is, is that once i get the boat in the water and get the engine warmed up, it wants to die as soon as i start to give it throttle and get going. It seems to me like it's flooding/getting too much fuel, but i don't know for sure. It's very frustrating. Most of the time i have to slam the throttle to get past that stutter/die point, and it will stutter a little and get going. But not EVERY time... The motor does run fine on the top end. Pushes boat real nicely. But i'm just sick of it dying on me. I have to use the choke every single time i turn the key also. And i also have to use the warm up lever, even after the motor is warm. What is the deal? Here are some details about the motor:
New CDI/Power Pack
New water pump
New spark plugs
updated wiring harness
cleaned carbs (these do NOT have the adjustment valves)
coils are original to motor but work fine (i think)
Compression: TOP = 130 psi • BOTTOM = 115 psi (is this too far off?)
fuel line is new, gas tank is new
screen on fuel pump is clear
fuel pump is original
foot oil changed
engine oil = quicksilver pre mix, 50:1
Below are pics of the motor and the spark plugs. The left plug is from the bottom piston. As you can see it is darker than the top plug. I will also attach a link to a video of it running on a hose. So now i ask, how can i fix the problem of it dying every time i try to get going? Thanks!
video: https://www.dropbox.com/s/zhjyjunh6a5gp5p/20150719_095651.mp4?dl=0
