My 89 88HP Johnson now won't stay running...

Guvner

Seaman
Joined
May 23, 2004
Messages
61
I just finished figuring out why it was overheating after changing thermostat and water pump. Blowing out the heads water passages turned out to do the trick. I then proceeded to do the Sea Foam thing and blow out the carbon. Everything was fine. I even did it a couple times as I had never done it before and after doing it the first time and not picking up that much compression I decided to do the cylinders. Afterwards I blew out the cylinders like the dealer told me to do. (pulling the spark plugs and just pumping out the air as it compressed for about 5 seconds worth of turning over..)<br /><br />I ran it for 5 more minutes and then changed the plugs. Ran it for another 10 minutes and shut it down.<br /><br />Took it to the lake and their it started right up, ran for about 3 minutes and died for no apparent reason. Tried to start it again. Wouldn't stay running. Pulled the gas line looking for some kind of air lock. Made sure it was getting the gas to the pump. Would start occasionally at a high rate but die off as if it was starving for fuel. If you pump up the ball it gets pretty hard. On the way home I picked up a new fuel pump already assembled figuring it was the most likely culprit. <br /><br />Any thoughts? If it isn't the fuel pump I'm presuming I have to rebuild the carbs. Is that something I want to tackle? Done cars I've owned in the past carbs but not sure how similar this will be. Any advice on that? Dealer mentioned balancing carbs is tricky.<br /><br />Thanks... Gary
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: My 89 88HP Johnson now won't stay running...

Did you make sure the fuel tank vent is clear or open? Might try a portable tank if you have a built-in one now, new primer bulb and see what happens. I would also change the plugs after the decarb, as they may be fouled.. If you choke it while running, do the RPM's go up or does it want to die??
 

Guvner

Seaman
Joined
May 23, 2004
Messages
61
Re: My 89 88HP Johnson now won't stay running...

Yea... I opened up the fuel cap even as I went to start it just to make sure the 12 gallons that I put in the other day hadn't walked while at the storage area. New plugs with 5 minutes on them after I got done with the carbon cleaning. Never got a chance to test it with the choke idea. Pushing the keys in would cause it to start occasionally... <br /><br />Not sure if the choke was doing it or enough gas had accumulated to go again... Guvner..
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: My 89 88HP Johnson now won't stay running...

Could be the pump, but if you continue to pump the primer bulb when it's dying, it should stay running. Maybe not perfect, but it should run if it's getting fuel in some fashion, which pumping the bulb does, if the bulb is good.
 

Guvner

Seaman
Joined
May 23, 2004
Messages
61
Re: My 89 88HP Johnson now won't stay running...

I'm wondering about the screen. Wish I'd have looked while I was up there. Left the boat and came home though... Gary
 

Guvner

Seaman
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May 23, 2004
Messages
61
Re: My 89 88HP Johnson now won't stay running...

Is rebuilding the carbs much of a job on an 89 88 HP motor? What are the pitfalls?<br /><br />Can I unbolt them from the motor and just bring them back without the boat to work on? I haven't found my beloved (NOT) Clymers manual yet. I seem to have misplaced it. (the wife might have thought she did me a favor by throwing it away after she heard me talking about it..)<br /><br />Thanks... Gary
 

ppjmb5

Seaman Apprentice
Joined
Jun 25, 2004
Messages
47
Re: My 89 88HP Johnson now won't stay running...

carbs on that is easy to rebuild much easeir than a car carb just un bolt them from the motor bring them home get a carb kit the kit will have gaskets o-rings a seat needle and float with it it will not have your high spped jets there will be two screw caps on the side of the carb unscrew them and get a small flat screwdriver and un screw the jets clean those out good and spray some carb cleaner thru the port where it cam from , make sure you dont put the float back on backwards tighten gasket well <br />and your all set
 

Solittle

Fleet Admiral
Joined
Apr 28, 2002
Messages
7,518
Re: My 89 88HP Johnson now won't stay running...

I rebuit the carbs on one of my 1987 110hp last year and left the linkage between the carbs connected so as not to have to be bothered with syncronization. I am also lucky to have an air compressor to blow out the passages that you can't see. Not a big job at all.
 

Guvner

Seaman
Joined
May 23, 2004
Messages
61
Re: My 89 88HP Johnson now won't stay running...

Is there two kits or better asked is there two needles and seats in the one kit? <br /><br />I think I got it right. Thanks for the answer... Gary
 

Walker

Captain
Joined
Jun 15, 2002
Messages
3,085
Re: My 89 88HP Johnson now won't stay running...

One kit, one needle/seat per carb
 
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