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    1991 150 Johnson, No Spark at Cylinders

    Boat was running good about a month ago, I did a decarb took it out ran it and everything was great. Went out this past week and couldn't get it to fire. Did go down a long rough dirt road so I could have knocked something lose but I'm not sure. All I know is that I checked the spark at the...
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    91 150 Johnson Water in Right Side Cylinders

    First a little history.. 3 weeks ago motor was running top notch. Trolling motor went out and I ran a ground several times and had to blow out trash from tell tale of motor. Noticed that I had lost a lot of pressure from pressure guage, so I dropped the foot and checked the water pump. I also...
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    Water Pressure at WOT

    I just changed my water pump and I was wondering what the water pressure would be at WOT. It's a 1991 Johnson 150. Right now it reads 18 psi at WOT, I thought it would be around 24 or 25 psi. Also, could the fins on the impeller be put in the wrong way, I'm just wondering about that one. Any...
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    Water Pump Install Question

    I'm Installing a new water pump and I was wondering about the adhesives and gasket sealing compounds the manual calls for. Do you really need them or are they just there to keep the o-rings and gaskets in place? Thanks to all who reply.
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    Hit Bouy, Lost Speed?

    First off, Thanks to all that replied to a previous thread about Carb Leakage. Now I was crusing at low light conditions and hit a stupid crab bouy. Notice a half second loss of power but then went back to normal. After a couple of minutes of WOT I noticed that I lost 10 MPH on speed. Everything...
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    Trouble Shooting & Need Help

    I'm trying to figure out why my '91 150 Johnson stalls when given gas. It idles fine but cuts off when given gas. I need to know more about the antisiphon valve. I have two tanks that connect together then procede to the engine. I took off what I thought was the AS valve but it was hollow with...
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    Which Manual???

    I 'm wanting to get a manual for my 91 Johnson 150. On ebay they have two different ones and I was wondering which one to get. 1) Clymer Evin/John Outboard Shop Manual 2-300 HP 91-94. 2) Service Manual 90 degree Cross V Models 85-115 and 150-175, seller states that this is an OEM manual but I'm...
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    1991 Johnson 150 WOT Problem

    Hello, I'm a new member trying to get some help? Went out last week and motor ran great all day, fishing a hugh lake and had already shoot across several times. Late in the afternoon motor was idling fine but when i gave her some gas she died. Would Fire right back up but would stall...
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