Water on my plug

[Installer361]

I just bought a 76 merc 115 top im gettin a little water in the third cylinder is this common on these?Im not sure how long it has sat I had to put a trigger on it to get it goin it runs good lots of power but the gas thats in it smells like sh@t could thi come from moisture in the feul or would I see it everywhere? I ran it yesterday on the lake for 15 mins and it was only 1 little drop there seemed to be a bit more when I ran it on the muffs at home but neway will this quit after a while thanks a bunch for any help or infi

 

[Installer361]

Re: Water on my plug

I just bought a 76 merc 115 top im gettin a little water in the third cylinder is this common on these?Im not sure how long it has sat I had to put a trigger on it to get it goin it runs good lots of power but the gas thats in it smells like sh@t could thi come from moisture in the feul or would I see it everywhere? I ran it yesterday on the lake for 15 mins and it was only 1 little drop there seemed to be a bit more when I ran it on the muffs at home but neway will this quit after a while thanks a bunch for any help or info and by the way the water is only on the third plug other than that the piston tops look real good plug have a little oil residue as they should and like I said it runs great other than the cold start

 

[Chris1956]

Re: Water on my plug

Use some fresh fuel to eliminate that as the cause for the water. If you still have water, the exhaust cover is likely leaking. Post back results.

 

[Installer361]

Re: Water on my plug

Drained the feul yesterday took the plug out the bottom of the carbs from wat I could see it was clean in there nothin a little seafoam wont take care of.i thought id remove the cell degrease it and let dry for a deay .i hve the carbs with the vent line across the top wat do I do with ths to richin it up a bit and do I remove the inner jet I hear so much about .thanks chris and anyone else that may chime in I love these mercs and want it to be with me a while my last one was a 81 90hrse inline droped number three my guess it was over proped

 

[Chris1956]

Re: Water on my plug

Don't worry about the backdrag carbs for now. Run the SOB and see if you have water on the spark plug electrodes. Alternatively, see if the spark plug gets steam cleaned, and looks brand new. Both are signs of water infiltration.

 

[Installer361]

Re: Water on my plug

Don't worry about the backdrag carbs for now. Run the SOB and see if you have water on the spark plug electrodes. Alternatively, see if the spark plug gets steam cleaned, and looks brand new. Both are signs of water infiltration.

Ok chris new prob the water is gone but now my coil is arcing to ground out the side of it do I just need to get a new one

 

[Chris1956]

Re: Water on my plug

yes, if the coil arcs, it is likely time for a ne one. It is grounded well, right?

 

[Installer361]

Re: Water on my plug

yes, if the coil arcs, it is likely time for a ne one. It is grounded well, right?

Yes cleaned all the connections also turns out it is cracked on that side where it was arcing im guessin that was the path of least resistance . Ok tell me bout my carbs ive got a slight chipping on my piston crown could be from the sh%t feul but im going to tapp the water jacket at the top to cool her down and prob set timing at 19. for max spark do I need it wot then line my marks upthen check with a t light ur a smart guy pour it to me wat do u think about it

 

[Installer361]

Re: Water on my plug

This is my plugs u can c the one on the bottom to the end collected aluminum to the electrode havin difficuly uploadin photo can I email u

 

[Installer361]

Re: Water on my plug

Ok forget the plugs my timming is deffinatly too hot got that straightined out

 

[Installer361]

Re: Water on my plug

Can anybody tell me about backdraft carbs and how to get the best results to give my engine sevral years of use and has anyone ever drilled snd tapped the water jacket for a new tale tale to prevent burning the #1 cylinder or over heating thanks for any help

 

[Chris1956]

Re: Water on my plug

Gee, you have a fine engine design, Why do you want to change it?

Back draft carbs pull carb venturi vacuum thru the carb bowls. When RPM is high enough, volume of air overcomes ability of backdraft jet to supply carb bowl with fresh air. Bowl then has slight vacuum, which leans fuel/air mixture to motor.

 

[Installer361]

Re: Water on my plug

Ive read on here that because of todays feul its best to richin it up s bit .i know I ould ricgin the mixture screw and run 40-1 will that alone be enough to keep this tower goin for a while I do love this engine and dont want to toast this one no time soon ive also read on this site that being the tale tale hole is half way down the block it creates a air bubble up top and cause

 

[Installer361]

Re: Water on my plug

It to overheat up top on my last 81 model 90 hrse the tale tale hole was at the top of the water jacket plate so the theory seemed to make sence

 

[Chris1956]

Re: Water on my plug

Running 40::1 will not do anything positive for the motor. Make sure the waterpump is serviced every few years and keep the carbs clean. That is the best you can do. Remember that model was one of the most successful in the history of outboards. No need to re-engineer it.

 

[Installer361]

Re: Water on my plug

Well thanks for all your advice I guess I can move on to the electrical accy in the boat itself again thanks alot for clearin a few things up