60 hp Mercury Bogs when applying throttle

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Im new to forums so here it goes...

I recently purchased my first B.O.A.T. I bought an old 95 Astro Bass Boat from a guy who has let it sit for most of this year. I got a great deal on it knowing that it needed a little work. Im pretty good at researching to find problems and fix them myself but this one is definitely a doozey. So ill try to be as detailed as possible. The first time i took it out to see if there were any problems, There definitely was. The Engine started right up no issues. Backed off the ramp slowly. Turned around put it in F started moving slowly. Thought ok everything seems fine. Let me go WOT. Well it quickly died. I thought ok maybe it needs to warm up. Revved it all the way in neutral for a minute. Tried again maybe 1/4 throttle then bogged down and died. i figured ill take a look at everything and see what the issue could be. I talked to the guy i bought it from. He thought air in the hose or priming bulb was bad. Also suggested new spark plugs. Drain old gas etc. He said last time he had it all he had to do was warm it up and it ran good for the rest of the day. He had air in is line before and had the stator replaced about 3 years ago. Other than that he said it has done him fine. So i got back to the house. Had a 3 day weekend and thought it would be a good weekend project. This is what i did that weekend.

1. Drain old gas. Put fresh gas in. (Premix, took off oil injection)
2. Replaced Bulb
3. Soaked Carbs for 2 hours. Got them as clean as i thought they could get with what i had on hand.
4. Replaced Spark Plugs and coils.
5. Replaced all fuel hoses and added anti-siphon valve. (except for one hose. it looked new already.)
6. Took off Fuel Filter to omit that as a possible problem.
7. Still didnt run good so cleaned the carbs a second time just in case.
8. Check compression (120 on all 3 cylinders)

After that I had it running to a little more throttle. But would still die when giving throttle. All that in 3 days. Finally said ok Im done with this. A mechanic can probably fix this easier and quicker. So i dropped it off. They seemed pretty optimistic. So i figured it would be a quick and easy fix. They said I would probably have it back after a couple days.

A week and a half and 300 dollars later...

Today they gave me a call. I was pretty happy ( I thought It was fixed finally)

Heres what they told me

The bottom 2 carbs were not getting fuel so they replaced the hoses on the carbs
They adjusted the idle.
They took it to the river and said it was still doing the same thing. ( I figured)
They also said the thermostat was hot. (idk what that would mean)
They then suggested that the carbs need to be taken off and cleaned.
I told them no that 300 dollars and a week and a half was enough and that ill figure it out myself. I thought that was kind of ridiculous. Ill be paying them for the little work that they did do. Ill be picking it up tomorrow after work.

That is why i wanted to ask more people at once for advice on here.
Some of the things that I want to check when i get it is this:

-Soak carbs overnight
-check for proper venting
-try the primer bulb vertical orientation
-check the spark plug gap
-check drive shaft and lower unit for any gunk or obstruction for any reason
-check proper functionality of the fuel pump

Also the water pump is probably clogged its not a %100 stream of water coming out (could that be a symptom of this issue?)

Is there any other thing that I can check or do that I might be missing. I know someone else has had a similar problem and it was probably something dumb. But I am open to any suggestions. If there are any other questions or more details that I can provide, I will be glad to provide that because I want to get out on the water and get fishing on my new boat. Any Tip is greatly appreciated.
 

enginepower

Petty Officer 1st Class
Joined
Jul 5, 2014
Messages
260
First off, you can soak your carbs for 2 weeks and not achieve success. You need to get something to poke through the jet orifices and make sure all passages blow through correctly. Also need to check that the float height is set properly. 2nd, have you tried to pump the bulb while trying to accelerate? Sometimes the fuel pump can fail in a way that will still deliver some fuel but not nearly enough to run properly. There are lots of possibilities here but hopefully you just have a bad fuel pump.
 

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Thank you for the reply. I have tried pumping it. It does helps except that it is very firm and i can not pump it fast enough to achieve a steady throttle. I have to pump it very hard to achieve that success. I should also add that when choke is applied I get more power but still not maximum power as it should be.
 

enginepower

Petty Officer 1st Class
Joined
Jul 5, 2014
Messages
260
Ok so sounds like fuel problem then. Take your fuel feed hose going from fuel pump to carbs off and aim it at something to catch fuel. Pump bulb and see if you get a nice flow and bulb doesn't get hard any more. If bulb still hard to pump, you have a restriction in between the two or a bad fuel pump. If it's easy and flows well, you have internal carb problems or air leaks.
 

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Ok great news. I cleaned the carbs. Got it to not bog down at WOT. Now it hangs at 4500 rpm and every now and then will try an jump up in rpm. Maxes out at 5000 rpm then quickly goes back to 4500. Almost like it has a little more juice but something puts resistance and it so it goes back to 4500. I am considering this to be the fact that I don't have tilt and trim. So could that be it. Or maybe still a little gunned up on the jets keeping it from going full capacity?
 

enginepower

Petty Officer 1st Class
Joined
Jul 5, 2014
Messages
260
Jets pretty much won't get clogged then unclog and cycle as such. It's either running out of fuel due to weak fuel pump or restricted vent or you have spark cutting out. Does pumping the bulb help any when it does this?
 

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Ok. Took it out again today. Very slow hole shot. Sluggish to get up to rpm. Then stays at 4200 rpm. Not jumping up as much as it was. Choking and pumping didn't do anything differwnt
 

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Ok. Took it out again today. Very slow hole shot. Sluggish to get up to rpm. Then stays at 4200 rpm. Not jumping up as much as it was. Choking and pumping didn't do anything differwnt
 

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Adjusted butterfly valves on carbs to be perfectly flat when wot. Adjusted spark plug gap to specs. Running at 5200 rpm with motor trimmed all the way down. It might be good. It doesn't porpoise even though its all the way trimmed down and there's white smoke at idle. Should I call it good. Or is there something else I can fix.
 

BraxtonsPops

Cadet
Joined
Aug 19, 2014
Messages
18
Adjusted butterfly valves on carbs to be perfectly flat when wot. Adjusted spark plug gap to specs. Running at 5200 rpm with motor trimmed all the way down. It might be good. It doesn't porpoise even though its all the way trimmed down and there's white smoke at idle. Should I call it good. Or is there something else I can fix. I also put in higher octane gas.
 
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