Bogging issue Evinrude 50hp 2 stroke

[barrett75]

Hi all!
Hoping you may be able to help me with a problem...
I have a Evinrude 50hp 2 stroke, I think 99 model. Have had it for 3 months and had it completely serviced and checked over after I bought it and it has run like a dream for about 10 offshore day trips. Its started first kick and been great on fuel.
On my last outing it ran great all day at any speed and when I opened it up to head home it run at about 25 knots for a mile and then starting bogging and if I backed off the throttle enough it would even out and run nicely at about 8 knots... Try increase the revs and speed it bogs out and threatens to stall. So I had to travel 8 miles at low revs to keep it from stalling Then all of a sudden about 2 miles from my port it came good and I sat on 20 knots all the way back to the marina ???? It once again ran like a dream?
When I entered the marina and backed of to an idle in gear it threatened to stall a couple of times telling me there is still a problem even though it came good for the last 2 miles of travel....

At home now days later it still starts first kick and seems to be idling properly but this has damaged my trust in the motor for going offshore.... Does anyone have a clue as to what happened here?
I run it at 50 :1 and have never previously had a problem and I use it at least once a fortnight and usually 1 day a week.
I take 2 fuel containers and had not long switched containers when it happened, So could it be a bad fuel mix in one container? Plugs looked ok to me and were changed at last recent service. The squeeze bulb on the fuel line was firm when it was bogging and if pumped made no deference.

Last detail...this may mean something or nothing....when it cam good I could have sworn I heard a single click noise...could have been nothing to do with the outboard but I heard a click and then it ran sweet. While this is prob not part of the problem thought i better mention it....

Thanks in advance!
Rob.

 

[Home Cookin']

Re: Bogging issue Evinrude 50hp 2 stroke

bad fuel/clogged carbs

 

[tazrig]

Re: Bogging issue Evinrude 50hp 2 stroke

Hi all!
Hoping you may be able to help me with a problem...
I have a Evinrude 50hp 2 stroke, I think 99 model. Have had it for 3 months and had it completely serviced and checked over after I bought it and it has run like a dream for about 10 offshore day trips. Its started first kick and been great on fuel.
On my last outing it ran great all day at any speed and when I opened it up to head home it run at about 25 knots for a mile and then starting bogging and if I backed off the throttle enough it would even out and run nicely at about 8 knots... Try increase the revs and speed it bogs out and threatens to stall. So I had to travel 8 miles at low revs to keep it from stalling Then all of a sudden about 2 miles from my port it came good and I sat on 20 knots all the way back to the marina ???? It once again ran like a dream?
When I entered the marina and backed of to an idle in gear it threatened to stall a couple of times telling me there is still a problem even though it came good for the last 2 miles of travel....

At home now days later it still starts first kick and seems to be idling properly but this has damaged my trust in the motor for going offshore.... Does anyone have a clue as to what happened here?
I run it at 50 :1 and have never previously had a problem and I use it at least once a fortnight and usually 1 day a week.
I take 2 fuel containers and had not long switched containers when it happened, So could it be a bad fuel mix in one container? Plugs looked ok to me and were changed at last recent service. The squeeze bulb on the fuel line was firm when it was bogging and if pumped made no deference.

Last detail...this may mean something or nothing....when it cam good I could have sworn I heard a single click noise...could have been nothing to do with the outboard but I heard a click and then it ran sweet. While this is prob not part of the problem thought i better mention it....

Thanks in advance!
Rob.

Definitely sounds like a fuel problem. I would start by popping off the cover and following the fuel line to the fuel filter. (a 1 inch black square cover with a big screw going through the middle of it. unscrew it and check the screen (fuel filter) under it to see if it is clogged. If it is just remove the screen and tap it on a flat hard surface and re-install it. The clicking sound you think you may have heard could have been the auto choke sticking and then freeing itself. With the motor off turn the key to the on position and toggle the choke on and off a few times. If thats the "clicking sound" you heard just before everything went back to normal then 1) the choke plates are sticking on the carb or 2) you have a bad choke solonoid or 3) the wiring going to the solonoid is bad or needs to be cleaned. Either way sounds like a reasonably cheap and easy fix. Those 50hp 2 cycle Evinrudes are pretty bullet proof motors.

 

[Home Cookin']

Re: Bogging issue Evinrude 50hp 2 stroke

bullet proof but not protected from ethanol poisoning. check that second fuel tanl you suspected; how is the fuel onthe bottom? Once that phase-seperated gunk gets up into the jets/needles it's over. Fixable, true. And maybe even can be cleared with fresh fuel and some seafoam.

The screen filter catches solids but gunk goes through. Need a fuel/water seperator.

 

[barrett75]

Re: Bogging issue Evinrude 50hp 2 stroke

Thanks guys!
With Christmas in full swing and family visiting I haven't had a chance to try your suggestions yet but will do hopefully later today.

Tazrig there is no key start, its a tiller steer.

Will update later today cheers!

 

[rpsloan]

Re: Bogging issue Evinrude 50hp 2 stroke

I chased similar issues with my 115. Turned out to be a combination of sorts. Kinked fuel line that comes from the quick connect to the fuel pump, loose wire on the terminal bar, and out of whack carbs. I also replaced my fuel lines and tank to be 100% safe. The fuel line that kinked makes a hard u-turn back to the pump. I'd check that out for a quick fix. If it is kinked I would pick up a new hose and some brass 90* elbows to make the u-turn. Cost about $30 at Napa for two elbows, coupler and a new 3/8" fuel line. Good luck.

 

[tazrig]

Re: Bogging issue Evinrude 50hp 2 stroke

Thanks guys!
With Christmas in full swing and family visiting I haven't had a chance to try your suggestions yet but will do hopefully later today.

Tazrig there is no key start, its a tiller steer.

Will update later today cheers!

With no key start, no electric choke. Check the choke plates (thin circular pieces of metal in the front of the carbs that rotate 90 degrees) to make sure they rotate freely. There is a vertical metal rod that goes from the top carb to the bottom one. When you lift it up and down you will see the choke plates open and close. Make sure that moves freely and doesn't stick with the choke plates closed or partially closed. If it sticks hit it with a touch of brake cleaner to loosten up whatever is gooking it up and then with some WD40 to lubricate it.

 

[Silvertip]

Re: Bogging issue Evinrude 50hp 2 stroke

If the engine loses power suddenly like one cylinder was simply turned off, it would appear you have an ignition issue on that cyclinder. If it jerks a little, and gradually begins to act up then fuel delivery is suspect. Rule out the fuel pump and fuel lines because this appears to be a single cylinder issue. If it were fuel lines, filters, etc both cylinders would act up. The initial test would be to remove the engine cover and run the boat until the problem crops up. Immediately inistall a spark tester to verify whether or not both cylinders have spark. If not -- you troubleshoot the electrical system. If both cylinders are firing, you have a carburetion issue.

 

[barrett75]

Re: Bogging issue Evinrude 50hp 2 stroke

If the engine loses power suddenly like one cylinder was simply turned off, it would appear you have an ignition issue on that cyclinder. If it jerks a little, and gradually begins to act up then fuel delivery is suspect. Rule out the fuel pump and fuel lines because this appears to be a single cylinder issue. If it were fuel lines, filters, etc both cylinders would act up. The initial test would be to remove the engine cover and run the boat until the problem crops up. Immediately inistall a spark tester to verify whether or not both cylinders have spark. If not -- you troubleshoot the electrical system. If both cylinders are firing, you have a carburetion issue.

When it acts up its sounds as if your running out of fuel but comes good if you back of the throttle....

How do you know one or both cylinders are acting up from the info I gave?

Cheers Rob.

 

[barrett75]

Re: Bogging issue Evinrude 50hp 2 stroke

Ok found the fuel filter, do I only remove the center screw? Also there is blue oil on the inlet and outlet connections.... Not heaps but a few drops. Do i need to worry about this? is this a sign i have too much oil in the fuel? pic below cheers! Circled yellow is the leak areas.

 

[tazrig]

Re: Bogging issue Evinrude 50hp 2 stroke

Ok found the fuel filter, do I only remove the center screw? Also there is blue oil on the inlet and outlet connections.... Not heaps but a few drops. Do i need to worry about this? is this a sign i have too much oil in the fuel? pic below cheers! Circled yellow is the leak areas.
View attachment 177650

Just remove the center screw for now. If the screen is clear just reinstall and you're all set. You don't have to worry about to much oil as oil mixes with gas. You are using 50:1 marine 2 cycle oil and mixing it to that dilution correct?

 

[barrett75]

Re: Bogging issue Evinrude 50hp 2 stroke

Ok removed it and it was clean as a whistle.... So nothing bad found yet.... should I start looking into the carb as next likely cause?

 

[tazrig]

Re: Bogging issue Evinrude 50hp 2 stroke

I would try the carb next. Make sure the choke plates and the metal rod connecting them (from top carb to bottom one) move freely and don't stick. Assuming they move freely, get a new tank of fresh gas and put in some "sea foam" cleaner (this will clean out any gook in your carb you can't see. Run the motor and see if the problem is still there. If it is your carb float may be sticking although a dose of "sea foam" should correct this. It definitely sounds like a fuel problem. It's not a hose because you wouldn't be able to run at wot for more than a minute or so if it was. Your filter is clean. Fuel pumps on that era of engine are usually an all or nothing problem. If non of the above works than its time to look at electrical but i think its a carb issue. Good luck!

 

[barrett75]

Re: Bogging issue Evinrude 50hp 2 stroke

Will let you know how i go! thanks for your help mate!

 

[barrett75]

Re: Bogging issue Evinrude 50hp 2 stroke

ok put new fuel into a different fuel tub and took the boat down to the river yesterday, took it for a good run and it ran perfectly. started great and screamed along at full throttle. So considering I didn't fix anything I'm guessing it must have been a bit of crap that went through the carb or something to do with the fuel. Thanks to those who helped!

 

[jbjennings]

Re: Bogging issue Evinrude 50hp 2 stroke

If it gives you any further weird problems---especially after it's ran long enough to get good and warm, I'd be suspicious of the powerpack.
JMO,
JBJ