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| Johnson 5.5 seahorse outboard |
| Author |
Message |
    
Lreed (Lreed)
| | Posted on Wednesday, July 17, 2002 - 04:34 pm: | 
|
My johnson 5.5 hp seahorse outboard will not accelerate when I turn the throttle toward fast in foward. It reaches a slow speed and will stall if I continue to turn the throttle to fast. It seems to accelerate ok in nuetral. What could be the problem? |
Joereeves (Joereeves)
| | Posted on Wednesday, July 17, 2002 - 07:22 pm: |
|
Lreed.... First, check the compression, then make sure you have spark that will jump a 1/4" gap on both cylinders. Check that the carburetor throttle butterfly opens fully when you apply full throttle. If all of those aspects are okay, that problem is usually caused by a fouled carburetor. The cure would be to remove, clean, and rebuild it.
Joe |
Lreed (Lreed)
| | Posted on Monday, July 22, 2002 - 04:52 pm: |
|
Joe,
I checked the spark plugs on my johnson 5.5 seahorse and found them to be very fouled. I replaced them with new plugs and it ran great for three hours and then I had the same problem as before. I checked the plugs and they were fouled again. The plugs that I replaced were champion j8c. I noticed on the motor that champion j6jm or j4jm are recommended. I also noticed that the rich/lean settings are set very rich(6 and 4 of a maximum of 6).How can I keep the plugs from fouling? What do you recommend? |
Joereeves
| | Posted on Monday, July 22, 2002 - 08:24 pm: |
|
Lreed..... Use Champion J6C s/plugs gapped at .030. You don't say what year that 5.5hp is but since it is a 5-1/2hp, it must have a adjustable high and low speed needle valve. Adjust the carburetor as follows:
(Carburetor Adjustments - Two Adjustable N/Vs)
Initial settings are: Bottom high speed = seat gently, then open 1 turn out. Top slow speed = seat gently, then open 1-1/2 turns.
Setting the high and low needle valves properly:
(High Speed) Start engine (it will run pretty rough), shift into forward gear, take up to full throttle. In segments of 1/8 turn, waiting for the engine to respond between turns, start turning in the bottom high speed needle valve. You'll reach a point whereas the engine will either start to die out or spit back (sounds like a mild backfire). At that point, back out the needle valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest setting.
(Low Speed) Slow the engine down to where it just stays running. Shift into neutral. Again in segments of 1/8 turns, start to turn the top needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running. Eventually you'll hit the point where the engine wants to die out or it will spit back. Again, at that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.
When you have finished the above adjustments, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
Joe |
Lreed (Lreed)
| | Posted on Tuesday, July 23, 2002 - 09:57 am: |
|
Joe,
Are the needle valves adjusted with the rich/lean dials or are the adjustments made somewhere else with the engine cover removed? |
Joereeves (Joereeves)
| | Posted on Tuesday, July 23, 2002 - 08:30 pm: |
|
Lreed... Those dials you mention are simply knobs attached to the adjustable needle valves.
Joe (30+ Years With OMC) |
Lreed (Lreed)
| | Posted on Thursday, July 25, 2002 - 09:46 am: |
|
Joe,
I installed the champion j6c's and adjusted the the rich/lean knobs attached to the needle valves to 3 and 2.5,they were set at 6 and 4. I ran the motor for two hours and checked the plugs. No fouling and the motor ran the best ever. Thanks for your help. |
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