Re: 94 evinrude 90hp lack of power
In my short time coming to this site (its been a few days) I've noticed a lot of things. Two big ones stick out in my mind. First this site is chock full of information.
The second one, and this is major, too many threads here. Waaaay too many. Nobody scans through the thousands of posts that pose the same exact problems they are having just a different motor a different year. Not trying to come down on you dude, but there are a ton of posts dedicated to crappy running engines that won't accelerate, won't do this and that. My suggestion, as this is what I have found the most helpful, scan through FAQ part of the site. Then scan through the umpteen pages of info in the evinrude section. You'll find your answer and then some. You'll just educate yourself about motors in general. I'm finding for me it just starts to sink in better the more I read about the same problems but with different motors and worded differently.
So okay here's the straight poop with your motors. First and foremost you need to pull the plugs and look at them, you did that. But you need to keep them for observation purposes. You need to line them up in cylinder order so you can use them to diagnose what's wrong. I have a V6 Evinrude so I line them up starboard and port. If you have an inline, #1 cyl is on top. If you have a V motor, the #1 cyl is the higher cylinder between both sides. Now that the plugs are out, do a compression test. You want even compression on all cylinders with a over/under of about 5-10 psi. Low compression is bad, like lower than 80 or so.
Second is spark check. If you have a pair of insulated pliers, or better yet, plastic ones, you can hold the plug in the wire against the block and crank the motor. The better way to do it is a spark checker.
If compression is good and spark is good, the third component is fuel. You have some sort of fuel issue. If spark is bad, you may have an ignition issue. But it all comes down to compression.
Now go and read young Padawan.
