Seafoaming my Johnson - advice? | TigerDroppings.com
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Boats n Hose
LSU Fan
NOLA
Member since Apr 2011
36846 posts

Seafoaming my Johnson - advice?

My Johnson is damn near 20 years old now, it mostly runs like a top but it's little rough in the beginning at idle, and lately when I try to get it up on plane it sometimes bogs down slightly for a few seconds before it gets up and going.

I want to try seafoaming it first. Do I just get a can and follow instructions on it, or is there some better way to apply the seafoam to my Johnson?

Motor is a 94 Johnson 48 Special

TIA


Jester
LSU Fan
Baton Rouge
Member since Feb 2006
17459 posts

re: Seafoaming my Johnson - advice?
quote:

when I try to get it up on plane it sometimes bogs down slightly for a few seconds before it gets up and going.



When was the last time a mechanic looked at it? My dad had a Johnson years ago that started that, but it would "run fine" after that. Until dropped a cylinder....

You may not have that problem, but I'd have it checked out. Does it kind of bog down and surge?


Boats n Hose
LSU Fan
NOLA
Member since Apr 2011
36846 posts

re: Seafoaming my Johnson - advice?
No surge. Actually I have to let off the throttle, back down to idle, do it again, then all is normal.
Last time we had this type if problem was probably 10 years ago, it was the piece the throttle cable attached to cracked off. JB weld held up for the last 10+ years. Didn't seem to be messed up this time. This has only happened the last 2 times I took it out.

The shitty idling has been pretty much since we put the motor on this current boat, 3 years ago
This post was edited on 6/19 at 8:53 am


AlxTgr
LSU Fan
Kyre Banorg
Member since Oct 2003
38552 posts

re: Seafoaming my Johnson - advice?
quote:

Seafoaming my Johnson


MrCoachKlein
USA Fan
Member since Sep 2010
8120 posts

re: Seafoaming my Johnson - advice?
My Johnson does the same thing


Jester
LSU Fan
Baton Rouge
Member since Feb 2006
17459 posts

re: Seafoaming my Johnson - advice?
quote:

No surge. Actually I have to let off the throttle, back down to idle, do it again, then all is normal.
Last time we had this type if problem was probably 10 years ago, it was the piece the throttle cable attached to cracked off. JB weld held up for the last 10+ years. Didn't seem to be messed up this time. This has only happened the last 2 times I took it out.


If it keeps it up, I highly recommend getting it looked at. Things can go from bad to FUBAR really quick there.


Jester
LSU Fan
Baton Rouge
Member since Feb 2006
17459 posts

re: Seafoaming my Johnson - advice?
quote:

My Johnson does the same thing


How old are you guys?


Boats n Hose
LSU Fan
NOLA
Member since Apr 2011
36846 posts

re: Seafoaming my Johnson - advice?
Thanks


MrCoachKlein
USA Fan
Member since Sep 2010
8120 posts

re: Seafoaming my Johnson - advice?
21, but it's been through a lot


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drbaseball
LSU Fan
Member since May 2013
337 posts

re: Seafoaming my Johnson - advice?
Try shaking your Johnson there may be junk stuck in it


Jester
LSU Fan
Baton Rouge
Member since Feb 2006
17459 posts

re: Seafoaming my Johnson - advice?
quote:

Thanks


No problem, now it's time for dick jokes.


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Ole Geauxt
LSU Fan
KnowLa.
Member since Dec 2007
38834 posts
Online

re: Seafoaming my Johnson - advice?
His Johnson's pee hole may need to be blown out. My Yammer hammer used to get stopped up.


JAB528
LSU Fan
The Mexican Ocean
Member since Jun 2012
15060 posts

re: Seafoaming my Johnson - advice?


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Chad504boy
New Orleans Saints Fan
Five Oh Four
Member since Feb 2005
86498 posts
Online

re: Seafoaming my Johnson - advice?
just seafoam the tip of the johnson, just for a sec, just to see what he does.


Jester
LSU Fan
Baton Rouge
Member since Feb 2006
17459 posts

re: Seafoaming my Johnson - advice?
quote:

just seafoam the tip of the johnson, just for a sec, just to see what he does.


Wait, yours doesn't seafoam itself?


Bleeding purple
TCU Fan
Athens, Texas
Member since Sep 2007
22802 posts

re: Seafoaming my Johnson - advice?
Johnsons don't normally have those problems until their 4th or 5th decade. Is there a possibility the flow to the Johnson is restricted due to sugar or thick grease deposits in the lines? Maybe the pump is producing too much pressure damaging the lines? I know some guys will add nitrous to the fuel but that shite is dangerous and can blow up an engine with compression problems. You could have an extra bulb installed and manually pump the fuel to get things started just make sure to back off the pressure when you are done running the Johnson.


Since you noted the change when you put your Johnson in a new vessel have you made sure the vessel did not have some gradual changes? If a vessel's transom gets wider or the vessel absorbs water and gets heavier many times those Johnson's will just not perform well. Heck some vessels will not accept certain Johnsons. Maybe you need to try putting that Johnson in a new sleeker lighter vessel to see how it works there.
This post was edited on 6/19 at 9:12 am


CaptainsWafer
USA Fan
Bone it like you own it.
Member since Feb 2006
42310 posts
Online

re: Seafoaming my Johnson - advice?
quote:

just seafoam the tip of the johnson, just for a sec, just to see what he does.


So this is where the OT thread cane from.


Boats n Hose
LSU Fan
NOLA
Member since Apr 2011
36846 posts

re: Seafoaming my Johnson - advice?
quote:

So this is where the OT thread cane from.

Nailed it


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DonChowder
LSU Fan
Sonoma County
Member since Dec 2012
5780 posts
Online

re: Seafoaming my Johnson - advice?
Excellent advice BP.


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Chad504boy
New Orleans Saints Fan
Five Oh Four
Member since Feb 2005
86498 posts
Online

re: Seafoaming my Johnson - advice?
quote:



Wait, yours doesn't seafoam itself?




only in freshwater.


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