Check if your oil feed hose isn't bent or cracked.
It' a sign the oil from your tank couldn't get to the engine fast enough...
If it's a 2 hose oil tank, check if your oil tank cap is wel sealed.
SOURCE: 1974 60hp johnson outboard won't run on full throttle.
Carbs probably need to be cleaned and re-built. Common problem in outboards that havent been run in a while
SOURCE: 4000 onan will start and run 5 to 10 minutes and
check oil sensor and oil level check tank for sediment and lines and crb for sediment also coil maybe going bad!!! :)
SOURCE: Boat engine 1995 Johnson Outboard 70 HP
Ihave a 1991 70 hp Johnson outboard thats hard to start the first time but starts good after that. Seems to be flooded. Starting rpm seems to be low.
SOURCE: 1974 Johnson 70 hp outboard, quits on acceleration.
It sounds like your motor is starving for fuel. At an idle, you have adequate flow to keep the engine running. When you call for more fuel...you sputter and quit. Could be a clogged filter or trash in the line or in a jet. Yes you will have some air in the bulb, but not a great deal. You could be sucking air at a hose connection (loosing some prime)...try this, start the engine and slowly accererate, have someone pump the bulb as you accelerate, see if the engine works properly while doing this test.
SOURCE: my cub cadet tank stops running 5-20 minuts after
Yes you may need a carb kit. It is not good practice to by-pass the fuel filter. The orifice in the jet is very small.
But anyways, There Could still be a blockage inside the carb, a small leak at the manifold, or the jet is worn out.
Let me know how it goes.
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