1996 150 Johnson Ocean Runner RPMs

[Bseverini]

My 1996 150 Johnson Ocean Runner RPMs are topping out at about 3800-3900 RPMs. What can I do to increase the RPMs. I can only get top speeds to about 25-30 MHP on our 20" Neptune Boat. Please Help me out. I need to get this running correctly ASAP

 

[hidef]

Re: 1996 150 Johnson Ocean Runner RPMs

More info please. Is this a new condition or has it always been this way? What size prop are you running? Did you just buy the engine or have you had for a long time?

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

going to do the compression test in the next few hours and check gaps. the prop is a 17. just got the boat about 4 months ago. When I got it, it ran about 35mhp then it started to slow down to 20mhp so I checked the vents, Changed the gas sending unit, new inline filter, new peice coming of the elbow of the gas tank, new plugs. Also when I would run at WOT the check engine light came on for about a min. once I backed off the throttle it would turn off. But yesturday no engine lights came on. Ran much better but still will not get over 4000 RPM and will not go over 25mhp

 

[hidef]

Re: 1996 150 Johnson Ocean Runner RPMs

Check engine light is a fuel restriction. Sounds like you have checked everything from the tank to the fuel pump. Have you cleaned the carbs?

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

Model Number is J150EXEDB it is a 1996, getting ready to do the compression test in a few minutes. It is new to me had it about 4 months. When I put it in the water the first time it ran about 35 MHP then the next time it started to slow down some. Only took it out 4 times now. but only to test engine and see if the things I did worked. I changed the Primer Bulb, Water/ Fuel Filter, Spark Plugs to KGN plugs, anti siphon valve at the tank, clean out the vent line. That is about it so far. What else is needed to do? I will post the results of compression test and spark in just a little bit
dink1977 is online now Report Post Edit/Delete Message

 

[bob johnson]

Re: 1996 150 Johnson Ocean Runner RPMs

you should be going much faster...with out a baseline, we dont know too much though

your boat could be a water soaked foam, barnacle encrusted clunker.......with the motor mounted way off

but baring that, you should be going at least 40 mph

two baseline lines of info is neded

what your compression numbers are, and how is the spark in each cyliner??? will it jump a 7/16th gap???

from there we would know if we are dealing with a sick motor or a poorly proped motor


good luck

bob

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

Okay new problem... The results of the compression test and spark test are as followed. Spark was test with gap at 7/16 gap

Right Side Left Side
110, good spark 110, NO Spark
110, good spark 120, Weak Spark
110, good spark 110, NO Spark

So the new problem is the left side is not getting any spark at all. I checked the Shift switch and it seams to be working fine. The RPM are lower when it is pressed. I did a light test on the wire from the right side and there is steady power going to the right side of coils. But on the left side there is no power from the wires going to the Coils. The Power pack was put in last year Manufactured in 2008. I checked the connections in all the wire but they seam to be all connected well. does anyone have a wire diagram they could post or send me in email dink1977@suddenlink.net for the coil and all the wires? Not sure what to check now. Please PLEASE HELP......

 

[SeaSkiff]

Re: 1996 150 Johnson Ocean Runner RPMs

My Oceanpro powers the coils from the power pack. If yours is the same, Sounds like a power pack problem but could be coils. Can you swap sides with the coils as a test?

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

the coils are the double coils there are 3 of them. If I switch them will that kick the timing out of wack?

 

[SeaSkiff]

Re: 1996 150 Johnson Ocean Runner RPMs

You would have to switch the feed from the power pack as well. Does your coils have 4 leads on them? 2 from PP and 2 spark plug wires? If so, According to my manual, you should be able to measure the voltage on the wire attaching to the coil from the PP while cranking the motor. You must run the lead to a 10 watt 10 ohm resistor then to ground to simulate a load. Measure the voltage prior to the resistor. Should have 100 volts or higher.

You should have ALL plug wires and PP wires disconnected when running the test.

This should tell you if the PP is good.

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

I will try this tomorrow and get back with you all. If anyone else have any ideas or tips please send them to me.

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

been busy but doing it tomorrow

 

[SparkieBoat]

Re: 1996 150 Johnson Ocean Runner RPMs

check out the site below for troubleshooting chart

 

[bob johnson]

Re: 1996 150 Johnson Ocean Runner RPMs

get anywhere????

bob

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

Okay this is what did this morning. My neighbor has a 1997 Mercury 150 outboard. It looks the same as my 1996 Johnson 150. so we swapped out the power pack to see if I would get spark in on the port side of my engine. AND IT DID. so I went to the local dealership and purchased a new power pack. DO YOU ALL THINK THAT IS THE PROBLEM AND THINK IT WILL BE FIXED NOW

 

[bob johnson]

Re: 1996 150 Johnson Ocean Runner RPMs

well you bought the power pack......you probably cant return it , so just install it and tell us!! I am amazed that a mercury product fit on an OMC motor...

best of luck...

bob

 

[SparkieBoat]

Re: 1996 150 Johnson Ocean Runner RPMs

I think he meant Evinrude not mercury

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

OOps your right it was an evinrude... LOL

 

[SparkieBoat]

Re: 1996 150 Johnson Ocean Runner RPMs

I know some merc guys that would have called them fighting words...ROFL
without doing a full DVA test of your electronics you may have other issues that could cause your new power pack to fail or other unexpected failure that usually happens when you are about an hour from the dock with no other boat in sight and no cell signal. a $30 DVA adapter and 1 hour of time is well worth the investment.

 

[Bseverini]

Re: 1996 150 Johnson Ocean Runner RPMs

OK so I still need to finish all the Oms and volts reading. So the power pack could still not be the issue? oh no I hope i did not get something I did not need. but I was getting no spark at all with the PP that I took off and was getting fire with the new one. Let me know what you all think... I hope I did not just throw 250 bucks away