1984 Johnson 85 misses out

[Morkeleb7179]

just bought a 1973 Bass Cat with a out board 1984 Johnson 85 everytime i start it under idle its wanting to miss out when i puss the warm lever all the way down so i can give it throttle it dies and if i do it fast enough it will let me run it but misses out so bad. I put new NGK in it but still have that problem and im mixing 50 to 1 to a 6.6 gallon tank.. can some one please help

 

[Daviet]

Re: 1984 Johnson 85 misses out

Get rid of the NGK plugs, install the proper plugs.
Fuel ratio should be 1 pint of oil to 6 gallons of gas = 50:1 ratio.
You need to start with some basic checks, compression, spark and fuel delivery.

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

lol I thought those where the right ones.. Thats what came with the boat.. Compression is good. spark is great.. and the fuel looks good as well they ran 32 to 1 for a while in it untill i got it and i did a little reading and found out that it was 50 to 1 so i changed it and put fresh gas and oil in it.. What is the right plugs for this thing? Sorry I am new to all this first boat i have ever had

 

[Nutron]

Re: 1984 Johnson 85 misses out

Sounds like a carb rebuild, I would start with the basics..... check the compression, check the spark, how old is the fuel in the tank. Maybe the timing is off which will throw your idle off, Does it idle at all, without going into gear? How long do you give the motor to warm up?

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

the gas and oil is new and i let it idel for about 5 to maybe 10 mins i couldnt tell you how long it has been setting.. it took me almost all day just to get it started

 

[Daviet]

Re: 1984 Johnson 85 misses out

Don't see a 85hp listed in 1984, could you post your model mnumber?

 

[Nutron]

Re: 1984 Johnson 85 misses out

Check the spark color, should be nice and blue. Also get a carb rebuild kit, I would say your High needle jet is plugged, And depending on how old the fuel lines are I would also replace them, the alchol on older fuel lines is bad for them, they will deteriate the inside coating on the lines and plug up your jets. Also is the fuel line bulb hard when you squeeze it? this could be another problem, not getting the fuel you need. And while you are at it the fuel pump may need to be replaced also. You can unplug the line and put a gauge to check the pressure comeing out, but for all that hassle it would be easier to replace.

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

I'm sorry it's a 74 engine model number is 85ESL 74B

 

[Daviet]

Re: 1984 Johnson 85 misses out

Here are your plugs, #34.
http://www.ishopmarine.com/ishop/js...CatFilter=BRP&eCatSupFldr=supplier-100-005-EJ

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

ty so much.. do you think this is the problem this whole time

 

[Daviet]

Re: 1984 Johnson 85 misses out

Might be part of the problem, but as Nutron suggested, I think you are going to have to overhaul the carbs.

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

Thank you all for you time on this

 

[Daviet]

Re: 1984 Johnson 85 misses out

Let us know how it turns out.

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

will do im off work for the next 2 weeks and want to go out to the lake so this is my first project

 

[soundchaser]

Re: 1984 Johnson 85 misses out

take drain plugs out of carbs, Pump ball. See if they flow good and evenly. if not clean the carbs and make sure you remove the needle valve body from the carb body and clean behind that. ethenol has been ripping hoses up pretty bad.

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

So I put the new plugs in and took it to the state park fired it up ran great the second i put it in gear it dies.. forward and Reverse. I took the hood off and noticed a rod that's connected to my choke was just hanging there.. is there a diagram where I can see where this might hook up at.. And could that be causing the problem

 

[Nutron]

Re: 1984 Johnson 85 misses out

If the motor fires right up and you say there is a rod that is not connected somewhere..... I'm assuming the rod should be connected to the butterflys ( the choke paddles ) and then connected to the auto choke if you have one. If the rod is just hanging there than I would pull the cover of off the carbs and see if the butterflys are staying closed all of the time, if they are not opening when the motor is running all of the way then that could be your problem, do you have a Manuel? There should also me a manuel adjustment on the opposite side of the carb, make sure it is in full auto mode and then check to make sure the rod is secure. If you are trying to run the motor and it dies when you give it gas, the choke could be closed all of the way and you are just flooding it out.

 

[Morkeleb7179]

Re: 1984 Johnson 85 misses out

I took both carbs off cleaned them real good inside the bowl and out put everything back to gather fired right up.. i pulled each spark plug and there all firing.. shut it off to it to our state park put it in water and nothing wouldn't fire back up got it back home hooked the battery charger back up to it waited for a while just went out side fired right back up again i don't get it.. it will still miss out under high throttle

 

[Nutron]

Re: 1984 Johnson 85 misses out

Did you make sure the choke is opening all the way? You just said in your last post the rod is not connected. Pull the cover of while it is running to make sure the choke is all the way open, also while the engine is stopped use full throttle and look into the carb throat to make sure it is open and working proper, there should be no obstruction at full throttle, make sure both are working properly.

 

[Nutron]

Re: 1984 Johnson 85 misses out

Sounds like you are not getting enough fuel, or it is flooding out. Just pulling the carbs of to clean may not solve your problem, you may want to get a rebuild kit. It may only cost 20 to 30 bucks. Well worth it.