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2003 Johnson 150 (j150plstm) balance tubes

R

RayLP

Member
My motor has become hard to start after running to a fishing location. Now i'm getting a pop thru the exhuast while running above 1500 rpm. A mechanic told me I have leak on the stbd side intake. I disassembled the motor and the only problem I found was the lower bolts on the throttle plate and intake were lose and the port rubber hose on the port side is not connected to anything. The stbd side connects to a fitting at the lower part of teh power head.

What are the balance tubes used for and where does this hose connect?
 
I'd recommend getting a genuine OMC Service Manual and looking up your questions in there. Ken Cook .com Milwaukee, WI.
 
Boobie said:
I'd recommend getting a genuine OMC Service Manual and looking up your questions in there. Ken Cook .com Milwaukee, WI.
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I’ve been looking, but all I have found so far is a SELOC manual that covers every Johnson engine from 2002 to 2007.
 
The SELOC manual is good for paper in that little old out house everybody used to have. Try the Ken Cook in Milwaukee WI.
 
Re: 2003 Johnson 150 (j150plstm) Big mistake

faztbullet said:
The port one goes on bottom of air silencer.....
Click to expand...


Thanks for the info.

Going back to the original problem. It was hard to start and accerlerate after driving out to my fishing spot and setting for 30 plus minutes. Then it started popping thur the exhuast at any speed, but it sounded like it was from one cyl. After i changed the intake gaskets, i could get it to start and idle, but upon accerlration it would quit. Then I make the big mistake, a friends friend said that he knows this engine and can fix it. I delivered the boat to his house and told him i wanted to be there when he started work, to make a long story short, when I got there the carb linkage and timing linkage were both lose and the optical sensor were all lose. I retreived my boat and I'm trying to reassemble the motor. When I get to the WOT setting and when the detent plate is to be moved to WOT, the light on the Optical sensor testor is off and the procedure states iy should be on to complete the setting. I have went thru this procedure nemerous times to see what I missed. Did I miss a step or do I have other problems?

What I know has been done to the motor.
Compassion - 1 121 psi, 2 116 psi, 3 115 psi, 4 120 psi, 5 110 psi, 6 110 psi.
New coil assy
New power packs
New Champion spark plugs QL78YC /30
New intake and carburtor gaskets


 
Manual say to :hold timing wheel in position. Move outside detent tab rearward on detent plate till analyzer "CYL" light goes off.....not on
 
faztbullet said:
Manual say to :hold timing wheel in position. Move outside detent tab rearward on detent plate till analyzer "CYL" light goes off.....not on
Click to expand...

That’s the problem I have when the detent plate is moved to WOT, the light is to be ON. On mine as the detent plate is move to WOT the comes on and then about an inch before wide open the light goes off.
 
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