120 evinrude still acting up

[hookedonjc]

I have a 120 rude 1990 looper. rebuilt 3 years ago. I have had a loss of power problem the last two years. I corrected with a fin on the engine to get it planed off. I am now trying to get to the real problem. I found firing problem and had a local mechanic repair. He found timerbace bad and powerpack. So he said. $500 later same problem exist. although the problem went away right after the repairs about the 4th time out its back agin. All 4 plugs a firing a 7/16 gap on a tester I made. WOT under load 5200 RPM. Used to run atleast 5600 to 5800 and higher if I trimed on up. Now only 5200 nomater how high trim.

 

[Dhadley]

Re: 120 evinrude still acting up

If the parts are still under warranty then take it back to him. You paid him to fix it, let him do what you paid for. <br /><br />I'd take compression first just for piece of mind.

 

[hookedonjc]

Re: 120 evinrude still acting up

compression was checked and all four good average 115 psi. This thing has realy got me. Im no expert but you think if you can rebuild one and it runs for 3 years you can find this kind of problem. Oh yea tried new hot battery and nothing. more history I also put a new bulb new filter new tie wraps on all the fuel line connections and I tried disconnecting the wire to disable quick start thinking the timming was staying advanced 9 deg. Nothing helped.

 

[hookedonjc]

Re: 120 evinrude still acting up

Hey sorry to keep begging for suggestions Id realy like to nail this one on my own with your help of course but can any one tell me if my problem could be with the fuel supply. I had one of those clear fuel filters and I noticed it wasent completly full of fuel while running . Thats when I went and bought a solid filter. No change But could my problem be where the fuel comes from the tank with the piece in there?

 

[hookedonjc]

Re: 120 evinrude still acting up

Hey Im back agin. These local mechanics are driving me nuts. I took this thing to another local mech and he throws a OMC power pack on and says go try that, needless to say I tried it and went straight back and got my old pack back and here I am. I took my stator off and checked according to manual and its reading good no signs of melting either. I made the spark gap tester Joe Reeves suggested and a good 7/16 gap. I ran it on the hose today and it runs pretty good no spiting and spuddering . I did pull the plugs out and they were a little wet. I had also checked my primer today and it is fine no leak by. Currently I have
1 new CDI pack
1 new OMC timmerbase
Checked
primer OK
Fire OK 7/16 on all four
Compression good 115 to 130 PSI
Conditions
Want get on plane & sometimes rough idle
If i get towards front off boat it planes off but RPMS low at WOT 5000 max normal is 5800 at WOT
I was wandering about my carbs I rebuilt them when I rebuilt the engine could I have possibily gotton the two orfices in the wrong place The larger orfice is on the top Which the book calls it the idel mixture is that right would that be the larger orfice?
I know the floats are set according to the book. Holdig the chamber upside down with a straight edge across its about a 32nd gap.
Any Ideas ? I luv this stuff [colour=null][/colour]
Thanks
Hooked

 

[alden135]

Re: 120 evinrude still acting up

Do a search with my name, and you'll find all the problems I've had. There's lots of info available.

 

[rickdb1boat]

Re: 120 evinrude still acting up

Ever try hitting the primer(Push key) or pumping the primer bulb and see if she takes off? Fuel pump OK?

 

[hookedonjc]

Re: 120 evinrude still acting up

Yes I can hit the primer while its running and it drops about a 1000 rpms for a few seconds. as for the fuel pump when I rebuilt the engine I disconnected the oil injection and plugged the oil inlet off and disconnected the wire. Why would all my plugs Ql77jc4 by the way be oily wet looking . I am using the cheap walmat brand oil mixing 50:1 I used to run the evinrude oil before the rebuild could it be that simple?
Thanks
Hooked

 

[rickdb1boat]

Re: 120 evinrude still acting up

Nope. Oil wouldn't do it unless the mixture was too rich. If you checked them after idling, then they may have some oil on them. Pull the fuel line from the primer selenoid going to the carbs. Squeeze the primer bulb and see if any fuel comes out. Might be leaking excess fuel into the cylinders...

 

[hookedonjc]

Re: 120 evinrude still acting up

Ok Ill give that a try . I pulled it all the way off today and blew on the inlet side and nothing came out the two outlet hoses. I also took it apart and checked diaphram it was fine. May be you are right its just a little wet from just idleing. I have pulled them out on the water when it was acting up and they looked fine and dry . Where else should I check? hey alden135 My problem seems to be a little differant than yours thanks for the input though.Ill be watching to see what you find.
One thing I failed to mention is when i rebuilt i found my alarm buzzer melted so I disconnected it currently that circuit is open. I got to buy a new one. What about those orfices on the carbs does it sound like I have them in right it was three years ago. Im pretty sure i done them one at a time so Id get it right. the manual dont show which one is the larger orfice.
Thanks
hooked

 

[hookedonjc]

Re: 120 evinrude still acting up

What do you guys think ? Is there any thing else I can check? should I try another lynk & Synk
Thanks Hooked

 

[hookedonjc]

Re: 120 evinrude still acting up

Hey walker what do you think you helped me through my rebuild. I work I/e maintenance and I cant stand for somthing to stump me so I know how to cry for help sometimes.
Thanks
hooked

 

[Walker]

Re: 120 evinrude still acting up

I don't know if I mentioned it on any of your other threads but test the recirculation valves and test the inline oneway valve in the bottom hose of the recirculation system. Pull all the coils off and clean the ground straps and also clean the engine block where the ground straps contact. Flip the star washer and the flat washer around on the bolts that go thru the ground strap putting the star washer against the ground strap.

 

[hookedonjc]

Re: 120 evinrude still acting up

OK Ill check the recirculation stuff. I had checked and cleaned the grounds as instructed in a previous thread. All that looked good but i will recheck.
Thanks for the help
hooked

 

[hookedonjc]

Re: 120 evinrude still acting up

Hey Walker I need some help with hose routing if I recall right I was a little unsure when I went back with every thing 3 years ago. so we may be on to somthing. The manual just gives a generic route chart. So im a little confused if I got the dang thing right. I think im seeing somthing I might have wrong. Down at the bottom comming out of the crank case the hose ran from the bottom to top with a tee with a smaller tube connection with an arrow pointing up. [colour=null][colour=null]I had a small hose comming from a fitting on the top of the intake manifold down to the tee with the arrow.[/colour][/colour] Now on the starboard side of the engine I got a single tube running from top cylinder to the crankcase. And right below that a tube running from the other cylinder to a tee connecting to the crankcase and contuing on around right under the intake to another fitting on the crankcase. So there are two fittings right below the intake. I hope you can make sense out of this its a little hard to explain. I made a video of the thing as I broke it down but didnt get a good shot of the recirc lines The manual only shows one fitting on the bottom of the crankcase and nothing going to a fitting on the intake.
What ya think do I have it hosed up?
Thanks
Hooked

 

[Walker]

Re: 120 evinrude still acting up

I can only go by my shop manual and how my 94 is hosed.
Port side-top hose goes from the top recirc. valve to top cylinder. bottom hose goes from bottom recirc. valve to bottom cylinder.
Starboard side- the top one goes from top recir. valve to top cylinder.
lower hose comes from lower cylinder to a "T" , short hose from "T" goes to lower recirc. valve. Other side of "T" continues to oneway inline valve and on up to top of crankcase. Nothing else. Here's a rough pic if it works. I have a 86 and 94 120 and a manual. All have exactly this routing

 

[hookedonjc]

Re: 120 evinrude still acting up

Hey Walker I cant open up picture for sum reason.

 

[Walker]

Re: 120 evinrude still acting up

Hookedonjc, email me at tcaptain52@hotmail.com and I'll send the file to your email

 

[hookedonjc]

Re: 120 evinrude still acting up

Im thinking the line I got connected to the Intake is wrong but where does it go I see a picture of it in the manual in various different sections but cant tell where the other end goes . I had it hooked into the recirc. which is probaly wrong according to what your saying . do you have that line on yours? My manual gives an example of a 6 cylinder but even there I dont see anything comming from the intake. I just went out and looked at it and its a fitting right above the VRO on the intake. I had that hose tied to that tee with the arrow.

 

[Walker]

Re: 120 evinrude still acting up

Okay, I got you now. Look for a small nipple directly below the pulse limiter. That's where the other end or your errant hose goes.