fouling plugs

[xjcj3a]

I have a 1997 115 hp evinrude intruder v4.

Its ran good since ive had it, except for plug issues. I premix i no longer have the vro pump. I mix to 50:1 exactly to the point of being OCD about it. But still my plugs end up oil coated. if i pull up to a beach and let the motor sit with it in the up position it can be a bear to get going again. Should i mix alittle less? run a hotter plug? what are my options?

 

[Chris1956]

Re: fouling plugs

That should not happen. Do not change the fuel/oil ratio. Maybe you have carbs spilling fuel into motor when you tilt the motor up?

Set the motor on high idle (Throttle only or cold start lever), and see if that helps.

 

[ondarvr]

Re: fouling plugs

The oil ratio is unrelated to this issue, nor does the plug heat range have anything to do with it. Sounds like you need to have the carbs cleaned and adjusted correctly.

 

[boobie]

Re: fouling plugs

Is the mtr running at the proper temperature ??

 

[xjcj3a]

Re: fouling plugs

carbs rebuilt last year, thermostats replaced then as well. carbs on the lower side of the plugs when the motor is tilted up. Which adjustment would this be?

 

[ondarvr]

Re: fouling plugs

Plugs being on the up side doesn't make a difference (to a degree), if fuel is flowing out due the float needle not seating well the carb throat will have extra fuel in it that will be sucked into the motor as soon as you turn the key. Or the float bowl will be empty and fuel will need to fill it back up before it starts.

Clean carbs this morning don't mean they are clean this afternoon, one gulp of dirty fuel and you're there.

Float level wrong, needle not seating, fuel draining back out of the carb, fast-start not working, leaking primer valve, poor compression, starting technique, etc can all cause starting problems.

What plugs are you currently using.

 

[xjcj3a]

Re: fouling plugs

champion plugs, i dont know the exact number off hand. but they are the factory recommended plug. I had the entire motor gone through last season by a good shop here locally. This has been an issue before and after. It starts right up, the issue comes into play when you want it to idle. It plan wont do it if i dont pull the plugs before i cold start. Once its going i dont have the issue that bad. Its frustrating.

 

[ondarvr]

Re: fouling plugs

The shop may have been good, but they didn't fix it which means they overlooked something, I'm not saying they did something wrong, they may not have run it the same way you do and may start it differently.

This next part was supposed to be part of my last post.


There will be unburned fuel in the cylinder when you stop the motor because you turned off the spark not the gas, so the final unburned charge can leave the plugs wet. If it sits for a while the fuel may evaporate, but if the motor is running cold it won?t happen quickly. Evinrude had some cooling systems that needed all of the components to work correctly or the motor could run cold even with good new stats.

 

[ondarvr]

Re: fouling plugs

When you say they are fouled, do you mean they're black with a great deal of carbon build up and won't fire, or are they just wet?

 

[xjcj3a]

Re: fouling plugs

Wet. It's quite a dark color

 

[xjcj3a]

Re: fouling plugs

I know temperature can be an issue with this, when the motor is at idle. the water coming out gets warm but i would say its a mild warm water. not cold but not hot. Could leaning the carbs out alittle help this issue?

 

[Watermann]

Re: fouling plugs

You should refer to the cold starting sticky thread. Also off the top of my head I can't remember, does your engine have a primer solenoid or choke plates?

http://forums.iboats.com/engine-fre...on-evinrude-cold-start-procedures-225510.html

 

[xjcj3a]

Re: fouling plugs

primer solenoid, replaced at the end of last year.

 

[Watermann]

Re: fouling plugs

The oil mixture has nothing to do with starting or not starting but it would have an effect on the health of your motor if leaned out. I would forget about that being a fix. Hard starting is almost always something to do with the fuel delivery system combined with starting procedures. Have you tested your primer to see if it works properly after replacement?

Most guys consider plugs being fouled as them being covered in carbon to point the gap is plugged up causing the plug not to produce fire.

 

[xjcj3a]

Re: fouling plugs

The issue seems isolated to the 2 lower cylinders. Float/needle seems to be sticking going to clean that and replace.Fuel was defiantly pouring out of the bottom left. Top plugs were clean but the bottoms were wet on one and soaked on the other. Any other ideas?

 

[boobie]

Re: fouling plugs

Check your temp once with a temp gun when it's idling. Also check your spark and compression.

 

[xjcj3a]

Re: fouling plugs

Motor won't idle. Where should I test?

 

[xjcj3a]

Re: fouling plugs

Meaning once it will idle Where do I test for temp and what's normal?

 

[pn]

Re: fouling plugs

after you fix your carbs take a look at your fuel pump. do a search and get dirty.

 

[xjcj3a]

Re: fouling plugs

What am I looking for with the pump I know where the pump is now. I hear the choke engage and disengage within it