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My outboard motor locks up, then I turn it backward by hand and it runs until it locks up again. can't find what is wrong with it

Johnson 50 hp outboard motor

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  • Johnson Master
  • 2,562 Answers

OUCH... ok.. do not try to start it again.. you can and will cause more damage! Is it in gear when you are turning it backwards or trying to make it run? (need to eliminate drive line issues)
How long with it run after you turn it backwards? ..will it actually run or just turn over? (turning an outboard backwards will damage the water pump impeller!!)..its something you need in perfect working order!
Remove the spark plugs.. see if there is anything on them except a little carbon....We are checking for damage to the piston/rings area. If there is anything on them but a little carbon, you have found the problem area...
If they plugs are clean, (and NOT new).. then you need to check further..You will need a GOOD mechanic to help you.. I would pull the flywheel to make sure you don't have any broken magnets/stator damage.
If the issue is NOT in the lower unit...then its in the power head. Take it to a professional mechanic.
Repost/reply with more info on what you have done.

Posted on Jun 06, 2017

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Posted on Jan 02, 2017

captainjeffq
  • 52 Answers

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

Posted on Apr 13, 2009

  • 6 Answers

SOURCE: 1974 johnson outboard motor 25hp stalls when hiting high end

Not familiar with that specific motor but had similar vintage smaller HP Johnsons. From my experience it sounds like it could be that the high speed carb adjustment is too lean. What I would try is running the backing off the high speed screw 1/4 turn to 3/4 turn, then test. If works better, screw back in in 1/8 turn increments until the problem recurs, then back out 1/4 turn and leave it there.

Posted on Jun 30, 2009

  • 23 Answers

SOURCE: I have a 50 hp 1975 Johnson outboard. When I turn

There is a switch in the control box that locks out the start unless you are in neutral. Open the box and put in a new switch,this is a safty device to keep it from starting in forward and throwing you out of the boat. Jim OMC retired Mech

Posted on Jul 07, 2009

  • 1 Answer

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.

Posted on Jul 25, 2009

Editor925
  • 285 Answers

SOURCE: 40 Hp Johnson outboard motors stalls out after a

May likely be one of two problems:

1. Fuel flow: Make sure fuel tank vent is open and not blocked while engine running. Check primer bulb is working and no air leaks along hose anywhere. Check function of fuel pump and ensure fuel is getting to the cylinders.

2. Overheating: Check engine isn't overheating and that water pump is operating properly while engine is running.

Posted on Sep 17, 2009

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I have a 50 hp Johnson outboard or do I disconnect the shift linkage to get the lower unit off


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There is a switch in the control box that locks out the start unless you are in neutral. Open the box and put in a new switch,this is a safty device to keep it from starting in forward and throwing you out of the boat. Jim OMC retired Mech

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1974 johnson outboard motor 25hp stalls when hiting high end


Not familiar with that specific motor but had similar vintage smaller HP Johnsons. From my experience it sounds like it could be that the high speed carb adjustment is too lean. What I would try is running the backing off the high speed screw 1/4 turn to 3/4 turn, then test. If works better, screw back in in 1/8 turn increments until the problem recurs, then back out 1/4 turn and leave it there.

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