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93 Johnson 150hp lost comp. #9040308 06/17/13 12:49 AM
Joined: Apr 2009
Posts: 1,039
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Kid Chuckles Offline OP
Extreme Angler
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Extreme Angler
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Joined: Apr 2009
Posts: 1,039
93 model motor. Has 4 plugs so guess it has 4 cyl.
Compression on one cyl. is down to 40psi and boat misses.
Starts fine then misses seems to run fine at 1/2 to full throttle. But you have to use the choke to get it to take off without dying pushing it in give some throttle push again and get to moving and then it takes on off. What do i do? Is this a problem i can fix myself with the help of a good book. I figure it has broken rings if losing compression. But although i can fix about anything on a vehicle this is different. What do you fella's think. I have changed all fuel lined from the bulb up. Still does this. HELP HELP HELP PLEASE

Re: 93 Johnson 150hp lost comp. [Re: Kid Chuckles] #9046666 06/18/13 10:06 PM
Joined: Aug 2010
Posts: 137
stickerman Offline
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Problem is the compression. Once you are able to get the rpm's up, that is covering up the miss. Eventually, it won't idle at all. Time for an overhaul. Not a good idea to do just one cylinder. If you are not a real good mechanic, than its best to have a pro do it.

Re: 93 Johnson 150hp lost comp. [Re: Kid Chuckles] #9048358 06/19/13 01:19 PM
Joined: Jun 2009
Posts: 978
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Tony Maynard Offline
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Joined: Jun 2009
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I've been around a lot of OMC brand 150's and up and never seen one with 4 cylinders they are a V-6 so are you sure it's a 150 or that it only has 4 cylinders? How many carbs does it have? a 4 cylinder will only have 2 and a V-6 will have 3.

Re: 93 Johnson 150hp lost comp. [Re: Kid Chuckles] #9050350 06/19/13 11:27 PM
Joined: Oct 2005
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kingdad101 Offline
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120hp I'm betting...


Re: 93 Johnson 150hp lost comp. [Re: Kid Chuckles] #9050651 06/20/13 12:57 AM
Joined: May 2003
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gary purdy Offline
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Their were 140hp 4 cylinder outboards then.


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