newby/76 evinrude 25 hp not running right.

[tjl76evinrude]

hey there. i have a 76 evinrude 25 hp, model 25602e duct taped to my lil 83' indian river boat mfg fiberglass flatbottom.

skippin a long story, it ran great when i got it. it had recently been on consignment at a store/shop before i bought it. they claimed to have replaced a coil, adjusted carb and idle.

the fun started when i found the needle for the bowl was worn and sticking shut. i cleaned the carb and put a rebuild kit into it and it hasnt really been happy since. ive adjusted and cleaned it again a few times. but it wont hold an idle very well and just recently it seems to be missing at higher RPM's.

trying to get on track here,

Is there a idle adjustment screw other then the low speed needle?
i reset the follower for the timing a few times and its happier, then using the tiller limiting screw i brought the idle speed up a little to where it wouldnt stall so quick. its been running decent at higher RPM's then not wanting to idle at all. also the new coil is nice but the old coil is moving around on the metal that bolts to the block. it still functions though.

so the probs are

where is the primary idle control "screw"
after running high RPM's it doesent want to idle
when running at higher rpm's its recently been missing. i was planed up and it choked a few times and almost died.
i just cleaned the screen on the fuel pump and the spark plugs are pretty new..

it seems like it isnt getting enough fuel but if i pump the bulb when its staggering it seems to almost make it worse.

any suggestions?
thanks!

 

[HighTrim]

Re: newby/76 evinrude 25 hp not running right.

How thorough was your carb rebuild. Did you actually take the jets out and clean them, or just soak them. Soaking them alone isnt sufficient if they are gunked up. You will need a special tool to remove these, which you can make yourself. FR has a good pic with dimensions to show the specs. Pretty much a screw driver grinded down with a belt sander.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

before i found out the float needle was sticking i had disassembled and cleaned it probably 3 times, then again when putting the kit in. its a super simple carb and i probably ran 4 cans of carb cleaner thru it as well as seafoaming it a few times. i replaced everything i could with the kit except for the low speed needle seat. it didnt want to come out easy so i didnt want to force it. i used the instructions of the kit without thinking of the manual i have. i dont think the instructions were the same for the float adjustment.

i also put a inline filter in between the fuel pump and carburator. im going to take it out and put a solid line in to eliminate the chance of the filter causing probs. the pump only puts out 3.5 psi at full throttle if i remember right.

Oh and i did buy the original technicians service manual from 1976, its nice to have but isnt quite as detailed as id like.

Thanks!

 

[PW2]

Re: newby/76 evinrude 25 hp not running right.

I'd be a touch concerned by that coil that seems to be "floating around".

Not at all sure what that means, but I have the same engine, and both coils are tight to the block. I don't think they would work properly if they weren't that way.

 

[HighTrim]

Re: newby/76 evinrude 25 hp not running right.

And what about the jets, were they removed and cleaned? The idle adjustment screw is on the starboard side , about half way up. I believe for you it should be set to 650 in gear under load.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

i did not remove the jets. they appeared to be perfectly clean but if i dont get it running right with the fuel filter out then im going back into the carb to remove and clean em..

the needle valve bushing is the thing i didnt replace. it looks as though if i removed the lead shot that i could more easily remove it but the kit didnt look like it had a good sized lead shot to replace the old one.

the moving coil was one of my first suspects but i have since put a zip tie on it to keep it from moving and the motor was able to run on just that one suspect coil.

i'll take a look for the idle adjustment screw. im going to work on it again tommorow.

thanks guys!


Oh i saw that there is filters for small evinrudes, so do you think my filter might be a prob?

 

[HighTrim]

Re: newby/76 evinrude 25 hp not running right.

If those jets arent cleaned properly, the job is only half done.

 

[iwombat]

Re: newby/76 evinrude 25 hp not running right.

I agree. You've got to remove them, clean them. And, just as important clean behind them. Lots of times junk behind them will just clog them up again.

I'd be finding a better solution for that coil too. If it's not now, it will become a problem.

I doubt your filter is a problem at all.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

the coils are fairly cheap but i dont have much cash to spend on the boat for now. it is functioning but it is on my list of things to replace.

i dont think the filter is a prob either but id still like to cross it off my list of suspects for this running issue.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

OK i went at the carb this morning. few things..

i wanted to get at the low speed needle bushing to replace it since the new one was in my kit. also in my service manual it showed the needle bushing so i wanted to do it. i removed the lead shot by the bushing and to the orifice and i am 99% sure the thing has no bushing in it and has not had one in it. with that the new bushing does NOT want to go in. even with some good motivation it did not want to make it past the first threads so i removed it and dont know what to do with that.

i did find that the float needle is now showing wear again even though it only has a few hours on it. im guessing this is from a improperly adjusted float. i set it up by what the kits instructions said, not by what the manual said.

i did remove the high speed orifice plug/jet. it was clean. i dont know what else to do for now. while its off id like to get something figured out but im loosing hope. im going to head to the local shop and see if they have some better carb kits.

i found no debris or gunk in the orifices.

think the improperly adjusted float could be the culprit?

 

[iwombat]

Re: newby/76 evinrude 25 hp not running right.

Visual inspection means absolutely nothing. I've cleaned out plenty of jets that looked clean, and after the cleaning performed better. Just clean it properly and forget what it looks like.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

what else can i do? next to having it dipped i dont know what else to do. i disassembled the carb again, removed everything i could including the jet and cleaned again, removed some of the lead shot and accessed/cleaned the orifices. i got a actual evinrude brand carb rebuild kit for 32$ at the boat shop today and put it in exactly to spec. i replaced the filter line with a new piece of fuel line. got it all back together and whoopty do, it runs exactly like it did. wont hold an idle and misses. after it warmed up it took to pretty obviously missing when i revved it. i got my inline spark tester out and both coils new and old lit up the tester just the same.

i think im out of ideas.

could something be buggered under the flywheel effecting timing?

im going to get some pics up.

 

[HighTrim]

Re: newby/76 evinrude 25 hp not running right.

What is your idle rpm in gear and under load?? What plugs are you running? Torqued to spec, 18 to 20 ft/lbs?

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

i have no idea what my RPM's are. what would i use to see what the rpm's are?

to get it to stay running i have to keep it throttled up. much higher throttle that what it used to idle on.

the plugs are good. they are some name brand that i got at boaters world a few months ago. i also just pulled em and cleaned em even though they were still fine.

 

[iwombat]

Re: newby/76 evinrude 25 hp not running right.

Just for grins, try squirting some WD40, deep creep, premix, or some other combustible in around the front side of the carb at whatever passes for idle these days. Does it perk up at all?

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

right after i put the boat away today i started thinking about testing for leaks like that. i'll have to try it later. already rained 3"+ here today.

 

[iwombat]

Re: newby/76 evinrude 25 hp not running right.

In just about every type of motor imaginable, someone gets the idea that carb mounting fasteners really need to be torqued down to about 9-billion foot pounds, give or take. When that happens, the whole front side of the carb bows and you get leaks. It can mainfest itself exactly like you describe. Pretty easy to test out w/ a little fuel.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

i think your onto something there wombat. i have been cropping a pic of my down so i can upload it and it does look like what you described. also there is oil all over the place. it looks like its coming from under the flywheel. lemme get that pic up.

 

[tjl76evinrude]

Re: newby/76 evinrude 25 hp not running right.

http://www.4x4parts.com/ubbthreads/attachments/561342-carb2.JPG


alright that link seems to be workin.

 

[HighTrim]

Re: newby/76 evinrude 25 hp not running right.

that link is not working, try a site called photobucket