80hp Johnson now BOGS at WOT!

[BonairII]

Went to run the boat today. It was "lean sneezing" for some reason the other day, now it's bogging. I'm at a loss as to what the prob is now.

All 4 cylinders are now firing, so that's not the prob. I took off the carbs and cleaned them again just to be sure no gunk clogged it up. Found nothing.

It's starts very easily and idles just fine. When I get away from shore, and hit the throttle it bogs. If I pump the pump vigorously the motor bogs and stalls completely.

It ran well the other day when only 2 cylinders were firing, but now that all 4 cylinders have spark....I'm bogging out. What the heck would cause this??

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

try link n syncing your carbs. If you were running on only 2 cylinders I would change my plugs. you probably fouled them.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

Plugs look good. No oil on them. I changed plugs the other day and only ran for about 5 mins since. I don't know how to link and sync this motor.(1967 Johnson 80hp).

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

if you do a search on here for link n sync there are a bunch of threads on it. Basically make sure, without the engine running, that your butterflies on your carbs are opening the same amount at the same time. If there was no oil on the plugs then you may no be getting fuel to them. Pull the plugs and crank the engine and make sure that you have a mist of fuel/oil that comes out of the holes. If one hole does not have any then you need to clean/rebuild that carb.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

I have 2 carbs that are part of a single body, so the butterflies have no choice but to open at the same time.

I've searched and can't find info on sync and link for my motor(maybe I'm searching incorrectly).

Anyone know why I can stall the motor by pumping the primer bulb? Is that normal?

 

[AlTn]

Re: 80hp Johnson now BOGS at WOT!

it's not too difficult to produce sufficent fuel pressure to exceed the force the float places on the needle valve and allows the needle to be lifted off the seat which increases the fuel level in the carb and floods the engine...it's normal if you exceed the pressure necessary for operation....ever have to replace the water pressure control valve in your homes plumbing?..same deal..too much pressure and it'll force things to unseat..shower heads leak, facuets leak, water pressure will about knock the bottom outta the sink when you turn the faucet on, etc.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

it's not too difficult to produce sufficent fuel pressure to exceed the force the float places on the needle valve and allows the needle to be lifted off the seat

Ok. Understood. Right now I'm stuck at the whole 'link and sync' subject. I'm literally dead in the water(pun intended) until I can figure out how to sync my motor. I continue to read thread after thread trying to figure out why my motor is falling on it's face now, but I'm getting nowhere.
My boat is 25 miles away and it's turning into a royal pain in the arse to keep driving up there and not having any idea what to do next to get my motor running properly.

Also, I'm suspecting that I haven't set the points properly. I advanced the distributor until it was against the rubber stop and then rotated the flywheel til one set of points opened fully(and the other set closed) and set to .020. Then I rotated flywheel til the other set opened and set them to .020. Is that correct?

I'm out of money right now, so buying a manual is going to have to wait. I really need some help. I'm hoping that there's someone here that owns a '67 Johnson 80hp that can explain the sync/link for this motor.

This a video of the motor bogging. Getting a lot of water out the exhaust, but also a lot of smoke which is def something new. I expected to find fouled plugs, but they're not. The threads of the plugs have oil on them, but none on the electrodes so I assume that means that the plugs are firing.
http://www.youtube.com/watch?v=Tt04yzY_xe0

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

Didn't realize the year. Take your plugs out and turn the engine over. Make sure that you get a mist of fuel out of all the plug holes. If you don't you will need to rebuild that carb as you have to get fuel/oil to each cylinder. If you have fuel to all of them you might be sucking air from somewhere. Are you sure the gaskets behind them are good? Make sure EVERY connection on your fule line is clamped. Any air getting in can cause this.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

Bad fuel connections would cause the bogging? The fuel lines are old, so that would be awesome if it could be something as simple as that.

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

If you are pulling in too much air it will screw a lot of things up. Sometimes it will act like bad spark or something else.

 

[Swivelhart]

Re: 80hp Johnson now BOGS at WOT!

I had a 67 Johnson 60hp that acted just like what you are describing minus the smoke out the back. My lines were old and it did the same exact thing. Went to walli world (wallmart) and got new line and primer bulb. Ran perfect immediately!!!

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

You also need to check every fuel line on the engine.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

Changed all the fuel lines. Motor still ran like crap. I noticed that the shift linkage was screwed causing the "stop"(or whatever it's called) to NOT allow the dist cap to advance. I would assume that could very well be the cause of my bogging down. I fixed the linkage(had to drop LU again-long story) and went to start the motor and now it's lean sneezing again! What the heck could make it go idling perfectly to lean sneezing without me making any changes?
It starts immediately, but starts sneezing and then quits.

http://www.youtube.com/watch?v=C-BK7S7QqVo

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

do a compression check. Might not like what you find but it will answer some more questions. Might just have a bad head gasket but it could be worse.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

Fireman, do u suspect some kind of cylinder damage?

 

[soundchaser]

Re: 80hp Johnson now BOGS at WOT!

take carb drain screws out, pump ball if there's not even gas flow, clean carbs. Make sure you take the needle valve body out of the carb and clean behind it.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

Checked compression ...90psi across the board. Swapped out carbs and fuel pump from my parts motor.... NO CHANGE! Still sneezing(or whatever that "poofing" out the exhaust is called). Fuel lines tight, no leaks.
I see some fuel in the water after i run it for a few seconds. Maybe that's normal.
I'm posting from my phone, so if anyone has any suggestions let me know cause I'm at the boat and can make changes and post results immediately.

 

[fireman57]

Re: 80hp Johnson now BOGS at WOT!

I'm glad your compression was good. A lean sneeze that doesn't go away is a lot of times low compression. If you have water in your fuel get rid of the fuel. Put it in your truck it won't hurt it and make sure you have fresh fuel and oil. You can put a water separator inline before the engine and it should take most of it out. As you are finding out water doesn't burn very well.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

Water in the gas could cause the sneezing? I'm seeing a decent fuel slick behind the motor after I've run the motor for 10 seconds or so.

 

[BonairII]

Re: 80hp Johnson now BOGS at WOT!

I need some additional troubleshooting tips for the sneezing(if indeed it really is a lean condition.

Here's the rundown of what I've done so far:

-Checked fuel lines for leaks
-Changed carb, dist rotor. and fuel pump(from parts motor)...no change
-Checked plugs and all wire connections
-Pumped bulb while motor was "poofing"....no change
-There is a fuel slick behind motor after motor has run btw, so it must be getting fuel
-Seated and adjusted low speed needles (still seems to idle a bit high)

I'm starting to suspect it's a timing issue. Maybe it's firing before the fuel gets to the cylinder. I'm too new at outboards to go much further without more help. I'm getting to the point that I feel like pulling the plug and sinking the darn boat.