Heat problem-maybe.

[jtcarter]

1995 175 evinrude intruder. I've been down a few hundred rpm since early june. 5500-5700 range is where the boat had been running prior to new vro install and air idle screws being adjusted. Now at WOT i'm around 5200. I don't know if its the water being hotter or a problem with my motor. Motor sounds flat up on top end. I've done a plug check on it and all the starboard side plugs have a nice light tan to them and seem to be burning perfect. Port side is a different story. #2 looks good on the tip and the top part of the insulator, but down inside of the insulater there is a black dark spot. #4 looks like it might be burning just a tad lean.... lighter tan than the other plugs. #6 looks almost black all the way to the top of the insulator. One little section of the insulator is not completely black, not wet, just black. Compression readings on the port side are #2 104 #4 101 #6 95. I did a decarb a few weeks ago and charged my battery, #6 came up to 100 on my gauge after that. These are cold readings. Warm they're all 95 to 100. So basically i can't determine if the port side is getting too hot or i'm getting a small amount of water intrusion into that side. I was about to go through all of the recirculate check valves and install a new manifolfd gasket,maybe do a light test with the leaf valves. Carbs have been gone through time and time again. Old guage and its a looper so those compression readings are typical. Puzzling deal.

 

[jonesg]

Re: Heat problem-maybe.

so to recap,
compression is fine.
carbs are thought to be good.
what about a spark check?

usually when port side starts acting up I think power pack.
If you have a Peak meter the tests are not too hard.

 

[jtcarter]

Re: Heat problem-maybe.

so to recap,
compression is fine.
carbs are thought to be good.
what about a spark check?

usually when port side starts acting up I think power pack.
If you have a Peak meter the tests are not too hard.

I've pulled them one at a time and they make a noticeable difference here in the driveway. But under load and heating up i don't know. I've thought about the pack, but i can't determine if those spots are from oil or heat. I've thought about the thermostat...checked it, visual looks good, might change it anyway. I'll try to run the tests on the pack, i do also have another pack i could throw on there and try. I was thinking heat and loss of power due to heat. It is a CDI pack and i've heard horror story's about them. Its about a year old now might still be under warranty, but i doubt it. I have a OEM pack that i took off of it thinking the same thing last year. Come to think of it #4, #6 had weak spark on that pack. I guess i going too have to try and do those tests afterall.

 

[ondarvr]

Re: Heat problem-maybe.

Did you check the coils? They go bad so frequently that checking them is one of the first things I do when when RPMs are down slightly.

 

[jtcarter]

Re: Heat problem-maybe.

Will do while i'm at it. They're also less than a year old, but that doesn't mean much these days.