1988 Johnson 25hp Outboard bogging down under load

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,612
sounds like it would be a good idea to revisit carb work. Disassemble, soak, soft wire in every opening, carb spray.... Clean idle circuit...
 

Tmac908

Cadet
Joined
Jun 12, 2018
Messages
16
I just recleaned the carb tonight. I am going to try it out tomorrow. I will let you guys know how it goes
 

jasper60103

Commander
Joined
Sep 18, 2008
Messages
2,055
I just recleaned the carb tonight. I am going to try it out tomorrow. I will let you guys know how it goes

You may want to check out This Old Outboard channel on YouTube. He did a series of videos on this vintage of motors. It may give you some ideas. Entertaining to say the least. :)
 

BTL

Petty Officer 2nd Class
Joined
Feb 22, 2017
Messages
106
Thanks BTL. I guess changing the lines will be my next step. Was the crack in the primer line on your motor visibly leaking fuel?

Yes, and when I primed it actually sprayed out of the crack.
 

Tmac908

Cadet
Joined
Jun 12, 2018
Messages
16
Today i took it back out. It idles really well but now even with me pumping the bulb i cant get it over idle. While i was out there the motor shut off and wouldnt start again. The primer bulb was hard but i had a feeling that there was no fuel getting to the carb bowl. I removed the bottom plug of the carb and sure enough it was empty. While the bottom plug was removed the bulb was still hard and would not pump any more at all as if there was a blockage. I removed the line that runs from the fuel pump to the carb and fuel came spraying out and the primer bulb softened again. So the problem was definitly in the carb. Thinking the needle must be stuck i took the carb apart and put it back together again. This at least alowed the motor to start again but my original issue was still there. Im hopeing what happened is related to my original issue. Anyone ever hear of this? Am i i correct in guessing it was a sticking needle?
 

Tmac908

Cadet
Joined
Jun 12, 2018
Messages
16
And i want to note this is immediately following a carb clean and rebuld, which included a new needle
 

Bosunsmate

Admiral
Joined
Apr 7, 2012
Messages
6,135
Yes sticking needle, you definitely arent quite the first ever with that!. Check that the float hasnt swollen over time as that can happen making it get stuck
 

jakedaawg

Rear Admiral
Joined
Jun 26, 2012
Messages
4,275
OEM carb kit? Is there a washer under the seat? Is it supposed to be there per part's break down?

And, the most common rookie mistake with these carbs by DIY guys is...installing float upside down. It's actually counter intuitive.
 

Tmac908

Cadet
Joined
Jun 12, 2018
Messages
16
The motor is working now. I re-cleaned the carb and that did the trick. I am not really sure how or why cause it seemed spotless after the 1st cleaning but I am not complaining! Thanks to all for their help and input.
 
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