90 hp 1984 Evinrude low power at WOT.

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

Can't find any serial numbers or data tags of any kind on the power packs.

And can't check ohms anymore tonight. The boat is outside and its 10 pm here

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

Check the two plugs that come out from the timing base and also check that they dont have continuity to ground.
Same with the stator, check both plugs to both powerpacks. Check resistance between both pins in the plugs.
The required ohmns are in the link above which i cant open right now but if you report back the figures il, or someone else will let you know whether they are in the ballpark as i did it on someones here the other day so ive some figures in mind

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

Ok I'll do that first thing in the morning. Got a link to any wiring diagrams so I can see where the wires are and what color they should be?

This is an old motor and a lot of the wiring colors are hard to be sure what they are.

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

If you post a photo it could help.
The timing base wires will move when you shift the throttle, the stator wires nomally stay put. You can just record the reading from both plugs going into each powerpack, the timing base ohmn is about 1/10 of that of the stator so its not really necessary to check which reading is from which module as of yet as it should be clear unless there is a problem, if so you can then do more tracing back to find out which ones the difficult child

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

Do check to ground, none of those pins should have any ohm reading to ground

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

OK Yeah I noticed the wiring harness coming from the timing base when I had the fly wheel off. The run down the same side as the starter motor is on. I'll just have to remove some wiring covers to see where they go in the morning. Then do the checks. Thanks for responding. This is really frustrating and my local repair guys only skills are cashing checks and running the credit card scanner.

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

No worries, I might be around, depends on work but someone will point you whats what as its a very common check by those on here.
Yep thats it they run down the same side starter motor

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

meter was on fritz so I'll need to pickup a new on this weekend
Thx

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

I checked both sides and FROM THE HARNESS no ground on either plug on the GREEN wires but on both plugs the black wires had ground.

FROM THE POWER PACK PLUG all of the pins were open, no ground.

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

Which are the black ones? Stator or timing base?
How did the ohmn readings turn out?

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

Timing base I think. The part that moves. And I haven't done any ohms testing. That was something you said I should do after I did the continuity test. But I don't have a clue how to do that.

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

Just get a reading between the two pins on each plug to test ohmns.

Just wondering what the black wires a. Are these the black wires that plug from the timing base to each powerpack?

 

[Fed]

Re: 90 hp 1984 Evinrude low power at WOT.

Your first post sounds like confusion plus a spun prop hub.

This is what its doing today. It starts really hard, and very cold blooded. Needs lots of choke and seems to lack either the power or rpms or both to get the boat to plane. Yesterday I had it out testing it and went through some weeds. It caused the prop to cavitate and I'm pretty sure the motor went to WOT. I let it run like that for just a couple of seconds to make sure it would stay that way and it did. As soon as I let off the throttle and ran it back up...... same thing. Just acts like it doesn't have enough power to run back up to a high rpm.

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

There are two connectors. One for each side. Each connector has 4 wires. 3 green and one black. The green ones come from the timing base the black one runs from the plug to a separate harness. It doesn't go to the timing base harness

 

[pegs11]

Re: 90 hp 1984 Evinrude low power at WOT.

The prop was just rebuilt and the cavitation was from weeds. Lots of weeds this time of year and really common for that to happen in shallow water.

 

[Bosunsmate]

Re: 90 hp 1984 Evinrude low power at WOT.

Ok, try the ohmn test next,