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Reman evinrude nearly failed cylinder drop test.

G

Georgiaboy67

Advanced Contributor
So my 97 evinrude 115 has a remanufactured powerhead that got put on last year. This engine has given me a run for my luck and my wallet for sure. I could continue on all my older threads but I think this is easier for me. So here goes. I did the typical pull the plug boot with engine running to see if all the Rpms drop. I'm running on all 4. BUT, BOTH Port cylinders barely dropped any Rpms. They did drop, but I had to put the boot up to the spark plug a couple times because I could barely tel a difference. But it did drop. Now on both starboard cylinders, there was A very noticeable drop in rpms when I pulled the spark plug boot. Does this mean I need to check out the ignition system?
https://instagram.com/p/BXl3ZI3gd-J/
this first link is what the idle on the outboard sounded like in neutral and in gear when I first got the powerhead put on.
https://instagram.com/p/BXl3wq9Adxd/
this second link shows what the neutral and in gear idle currently is. I must also note that this wasn't an overnight thing. Since I got the powerhead put on the Rpms steadily dropped each trip I took it out. Any advice and help is greatly needed and appreciated!! I'm trying to not pester work so much about my
boat since I'm always having issues..
 
We did a bore scope and no signs of scoring of cylinder walls, and not much carbon present. If it's the head I think it's either the head gasket or rings on both pistons didn't seat properly or are stuck?? Maybe?
 
Huh... I would say I don't believe it... BUT, you are right. The parts list on here only shows o-rings, along with my service manual specific to this engine. It shows a picture of the cylinder head with just o-rings. I think you may be right. Should also note that they are all bored at .0040 oversize
 
This might also explain why my idle continuously dropped as I ran the engine? And why one cylinder has 15% leakage on a leak down test
 
That is probably what did it... i know I tried my best to follow the break in as best as possible. I was very easy with the engine. But because my tach isn't operatable I'm not sure EXACTLY how easy I ran it. What would engine tuner do? I know we have some Yamaha ring free at work I could try if they are stuck?
 
I'll give it a shot and let you know what happens. Should I pull the plugs and spray some tuner into the plug hole? Or put some in the fuel?
 
Follow the directions on the can. Running it through the carb throats and leaving it sit for a certain time.
 
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