76' 25hp Evinrude

[notransitory128]

Alright guys, got one for ya.


I was having starting issues with my 25 hp so I rebuilt the card and fuel pump and now it starts. The issue is it only runs with full or half choke on and the throttle at WOT or half WOT. I have a cracked ignition coil but it starts fine so I don't think it is that. The cam follower is not even touching the cam between the points but looks worn. How can I try to adjust that. It looks like it needs to be adjusted. Not sure if that could even be it. Any suggestions would be great. Thanks!

 

[kodibass]

Re: 76' 25hp Evinrude

Does squeezing the primer bulb allow it to stay running without the choke? also try a straight gravity feed to the carb with the tank higher than the motor. sounds like you may have a couple of issues going on, start with the ignition, replace the cracked coil, or at least seal it (jb weld, slicon epoxy etc.) clean & check other ignition components clean gap points at 020, check plug wires etc. then look at your mag plate and sinc it to the throttle opening mark on the cam plate, the roller on the carb should just start to open the carb butterfly at the mark, check throttle & choke linkage and operation to find out what is causing the roller not to make contact with the cam, could just be dirty & sticking or a link rod. also if available try to run motor with another tank & hose. make sure the tank is vented & all fuel connections are solid (no air leaks) fresh fuel mix 50/1. good luck.

 

[notransitory128]

Re: 76' 25hp Evinrude

Thanks for the quick response! So, I went out and looked at the butterfly on the carb. I saw that sitting at idle the butterfly is all the way open. So it should be part way closed? Also, it looks like its the cam linkage thats not allowing it to touch, how do I adjust that? I really need to get a manual for this.

 

[notransitory128]

Re: 76' 25hp Evinrude

And now that I think about it, I don't think I have a vented gas tank. Its a cheap one from academy and I don't think it has a vent. I noticed one day that it looked like it was bloated and sure enough a TON of air came out of it. Maybe I should go get another tank.

 

[lindy46]

Re: 76' 25hp Evinrude

The butterfly should be almost closed at idle. Possibly when you had the carb off for the rebuild, you didn't hook the linkage up properly. Also check that the return spring is in place on the cam roller. Leave the cap on the gas tank cracked open and see if that helps.

 

[F_R]

Re: 76' 25hp Evinrude

Which butterfly are you talking about being open, the choke or the throttle? The throttle one will partially open when you pull the choke knob out. It's supposed to do that.

Reading your origional question, it sounds like you are talking about the breaker cam not touching the points. It is not supposed to touch them except when opening them. Set the points gap to .020" at their widest opening, that's it. And replace that cracked coil. If it isn't causing a problem now, it will---just when you don't want it to.

You can almost bet the farm that the high speed jet (orifice plug) is dirty, causing the need for choking to keep it running at high speed. It is in the very bottom of the carburetor, behind the hex plug, where all the gum and crud collects. It must be absolutely, positively, sparkling CLEAN without a trace of any goo or crud. On the other hand, do not be jamming wires and drills and stuff through it. Too big is just as bad as too little.

Back to the coils: Cracked ones are the Great Deceiver. You will swear that it has a fuel problem, when it actually is an ignition problem. Did I mention replacing it?

 

[notransitory128]

Re: 76' 25hp Evinrude

I was really starting to think it was an ignition problem. But it may be a combination of the dumb a@# who put the carb back together (me) and the cracked coil.

 

[notransitory128]

Re: 76' 25hp Evinrude



Here are some pics of the linkage setup now. How is it supposed to look other than this?

 

[notransitory128]

Re: 76' 25hp Evinrude

When your talking about the choke butterfly is that the one at the front of the carb, if so....wheres the other one?

 

[jasper60103]

Re: 76' 25hp Evinrude

When your talking about the choke butterfly is that the one at the front of the carb, if so....wheres the other one?

Look past the choke butterfly, in the back.

 

[notransitory128]

Re: 76' 25hp Evinrude

AHHH, awesome thanks!

 

[notransitory128]

Re: 76' 25hp Evinrude

I ordered my new ignition coil earlier, also do you think running a can of sea foam would help?

 

[Will Bark]

Re: 76' 25hp Evinrude

Refer back to post #6 F_R is giving you the best advice you could ever hope for. Good luck

 

[kodibass]

Re: 76' 25hp Evinrude

Well' yes a can of seafoam will most likely help clean up some of the carbon & gunk in the motors innards, will it fix your problem? most likely not. but it is a GREAT product for what it is meant to do,

 

[notransitory128]

Re: 76' 25hp Evinrude

How do I adjust the cam follower so it will touch the plate? I can't seem to figure it out. I ordered my manual too as well.

 

[F_R]

Re: 76' 25hp Evinrude

loosen the hex screws holding the cam, and slide the smaller end in or out as needed to cause the follower to contact it when aligned with the notch. Actually, all the slack is supposed to be out of the link and the butterfly shaft just barely ready to start moving when roller is aligned with the notch. Due to the design, they are very difficult to get "just right". Just do the best you can.

 

[notransitory128]

Re: 76' 25hp Evinrude

Ok, so I put the new ignition coil on and no joy!! This is getting so frustrating! What gap points are you talking about? Any more ideas on what it would be?

 

[gm280]

Re: 76' 25hp Evinrude

I know I'm not the brightest crayon in the box, but in the first two pictures does it look like the linkage connecting the front plate to the back plate is not installed correctly? It looks like there is something not right about how the rear linkage it attached to the nylon piece. I certainly could be wrong not having very much experience but something just doesn't look correct to me... Could be my lack of outboard knowledge though...