calling the Outboard guys...

[loworange88]

Hey everyone. I have a 1992 Johnson 4Hp Deluxe twin outboard. I got the motor used from a coworker. The engine did not really run when I got it, I had to remove the carb and give it a basic cleaning and put it back together. Also the water pump impeller was beat, so I changed that, and gave the bottom end a fresh fill of fluid. OK, so I can get the engine running if its cold(maybe 4-6 pulls), it will idle decent enough. So when I engage it into gear and travel across the water I can go about 300 yards(ish) and then the pitch of the engine changes, it sounds as if its under heavy load, then it usually bogs right down and stalls. The cylinder head where the spark plugs are seems to get hot, and I get a little bit of grey smoke under the cowl, but once I open it I cannot tell where it comes from. Restart at this point is super hard, if at all. After it sets for a while, it will start up again( usually alot of pulls) it will stumble 3-4 times before it actually stays running. So then all over again, it will run strong for a short distance and then peter out and die.

I was trying to keep sqeezing the primer bulb incase I was losing fuel pressure, but that didnt seem to make a difference.

I was suspect of the ignition coils, so I tested them with my meter, and one was 252Ohms, and the other was 260Ohms. My manual stated 275 +/- 50Ohms.

I was suspect of the safety kill switch at one point so I disconnected that via the factory single pin plug. I did test the continuity of the circuit and it checked out as "good" per the manual.

Lastly I have taken apart the fuel pump which seemed to be in decent shape, but I ordered a new gasket kit for it anyways and that is currently in route. What other items should I check or attempt at this point.

Thanks in advance.

[TreeGuy]

Tear that carb apart and rebuild with a kit. I'm sure there's one out there. Start there, but there's always the running tests, like the primer bulb, Have fuel lines been replaced ? Potential vacuum leak? Also potential that your coils are reading correct when cold, but under heat they go to crap. Just a few things that came to mind immediately.

 

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