Look Right?

[Skeeter54]

So been having issues on my 1984 Mercury 115 as far as no spark on any plug except for # 3. S needless to say it wont start. I noticed the female portion of the main harness going to the motor was missing what looked like the #2 female pin. Seem right? I attached a pic.

Also, noticed a brown milky fluid gushing out of the brass nut I'm pointing to in the second pic. Words of wisdom?

All new to me again so just a little history on the boat. I initially started with no spark to any plug to any plug except #3. I disconnected the black/yellow switch wires but no luck. I tested the stator and trigger and both were good. Put new spark plugs in. Sprayed the carbs with cleaner to start off since I would'nt really know where to start as far as taking them off and cleaning them. I've read some of you all say take the nut off the bowl and the carb and see if there is any gummy residue. Which, nut specifically?

 

[Skeeter54]

Any help appreciated

 

[racerone]

Looked at a control box and there is no pin on the wiring harness to plug into that empty hole.----Nothing should be coming out of the air jet.----Use a 7/16" wrench and remove brass carburetor drain plug on bottom of the carburetor.----Clean the fuel tank.------Remove the starter motor for inspection / cleaning / possibly new brushes.

 

[Skeeter54]

Okay thank you. Why would it come out of that jet though?

 

[racerone]

Float valve is stuck open.---Which means you should clean the carburetors .--All 3 of them !

 

[Skeeter54]

Roger that! Thanks. Like I said, all new to so baby steps I guess. Lol

 

[Skeeter54]

Question racerone. If I take all these off and clean them like I'm supposed to is there anything to it other than putting them back on? Just asking because I've heard the term "syncing the carbs" in some threads. I don't wanna just yank off and forget to do something as I put them back on

 

[racerone]

Clean carburetors are critically important to proper running of the motor.---The lubricating oil is introduced to the motor vial the fuel.--Thus any blockages in carburetors can reduce the operating life of the motor.---cleaning the carburetor is usually a " no money spent " exercise.---Not hard to do.---Removing the starter may help you in removing them.

 

[Skeeter54]

Sounds like my next task. Then I move back to my no spark issue I guess. Thank you greatly!

 

[Chris1956]

To make it easy to get to the carbs. Disconnect electrical plug. Remove the three 7/16" nuts on top of the cowl support. Remove two 1/2 bolts on top and bottom front cowl support. Remove 4 1/2" bolts on rear cowl support. Remove choke wire and remove cowl support. Remove 2 1/2" bolts on starter bracket. Remove starter wire and then starter. Use a 5/16" socket to remove the 6 carb cover bolts. Remove carb covers as a assembly. Use a 3/8 drive socket set to remove the carb nuts. Remove carbs, careful not to break plastic parts.

I would recommend replacing inlet needles and seats, floats and all gaskets. Should be $50 or so for parts. Set idle mixture needles to 1.5 turns out from lightly seated.

After installation of carbs, move throttle to see that all throttle plates open at the same time. Adjust bolts on plastic carb throttle connectors to make that a reality.

 

[racerone]

No spark ?---See post # 3 and look at the starter motor.---Another little money spent exercise !!

 

[Skeeter54]

Good deal. Thanks man

 

[Skeeter54]

Not questioning the info but I didn't think the starter had anything to do with spark plug sparking

 

[racerone]

If you have no experience then you would think that !--Fact is when a motor cranks over too slow there will be no spark from the magneto / alternator driven ignition system.--So a " no money spent " inspection might be worth doing.---On the other hand if you install 2 new switch boxes for big $$$, or a new stator and trigger for big $$ and you still have no spark. Then what would you do ??---Of course if money is plentiful you do not have any problems.-Sorry to be so blunt.

 

[Skeeter54]

Hahah. Nah man blunt is good. First boat so I'm learning as I go. I really do appreciate it. So I'm gonna clean the carbs and rebuild the starter. Thanks man