83 Evinrude 75hp will not run without w/o choke

[Quick-man]

I have a 1983 75hp Evinrude, 3 cylinder with type I carbs. Now the manual says type II but these are single throat.

The issue, is that I can get her started, and it will idle, but once I advance the throttle (or warm up lever) to the start position or further, I have to continuously hit the choke for it to stay running. I have read different postings that say if you can get it to idle and keep it runnning you may be able to run it clean, although I think if it is gummed up you may have to rebuild and clean them.
My question is, if I have to clean these can I submerge them in cleaner without hurting anything (do I need to take the orifices out if I do this? What type of cleaner should I use? I have hear of special tools needed to get the orificers out, is that correct?
Also I have read about a cleaner that you can add to the fuel to clean the carbs, Since it does run at idle at least, this may be an option. Does anyone know of such a product or should I just use an automotive carb cleaner additive such as gumout, slick 50 or STP tyoe of product.

 

[OBJ]

Re: 83 Evinrude 75hp will not run without w/o choke

Q-m....what is needed is a through cleaning and rebuild of the carbs.

My advice....get OEM carb kits. Cost a little more but you get the floats and the gaskets fit.

Soak the carbs out. You can get a gallon of carb cleaner from just about any auto store....I get mine from NAPA.

Follow up the soak with compressed air or Choke and Carb cleaner in a spray can. Blow through all the passages and make sure they are clean.

You can remove the orifices' with a screw driver of the correct size or grind one down to fit. If you can't get them out then leave them in and blow them out real good. Actually, a carb overhaul can be done with just a good tool box. No special tools needed.

No additive can do the job that a carb over haul will do. Don't take a chance on a lean running carb. Clean them up the right way and use the additives as preventive maint.

If you have any questions, post them here. Lot of good folks here to help.

 

[tashasdaddy]

Re: 83 Evinrude 75hp will not run without w/o choke

soak all metal parts, clean all plastic, yes, jets in oricifce have to come out. FR had a the tool on the old system. i'll try to find it. the only way to clean is disassembly, soaking, blowing out with compressed air, reassembly, with rebuild kits. then run Seafoam, to maintain them.

OBJ, and i were typing at the same time.

 

[OBJ]

Re: 83 Evinrude 75hp will not run without w/o choke

LOL!!!! But we was in the same ball park Bob.

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

Thanks guys you also helps with my drive shaft issue.

How about this for a try, open take the screws out for the hi and lo orifices and use carb cleaner to spray those out. Then cross your fingers and see if that helps. I saw a rebuild kit right here in the iboats store

http://www.iboats.com/mall/partfind...gd_poid=109344&gd_row=61&session_id=291342515
How does this kit look?

I guess I have my work cut out for me. There are a bunch of those plugs that come with the kit do I need to get those open and get to whatever is under them? I use to know what those were called...can't remember. Speaking of rebuilding should I count the number of turns the needle vale is out and set them all to the same. I know that you want all 3 set to the same since not having all carbs the same will result in poor performance.

 

[tashasdaddy]

Re: 83 Evinrude 75hp will not run without w/o choke

your on the right track, thats a direct replacement for 392061. recommend, soaking, then you can use spray cleaner instead on compressed air.

 

[OBJ]

Re: 83 Evinrude 75hp will not run without w/o choke

Always a good idea to knock out the core plugs to get at the passages. You can drill a small hole in them and then pry them out with a punch. Becarful when drilling that you don't go in to far. Drill just enough to get a hole through.

Rough setting for the needles is a turn and a half out. Or, count the number of turns it takes to gently seat the needle and then restore the needle to that setting. Likely the needles won't all set the same. Make the final adjustments with the boat on the water under way (in gear).

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

Took the carbs off this morning, only about 35 degrees out , but braved it anyway. When I took the intake silencer off I noticed that there was black stuff that resembled TAR in the top carb, not a good sign, so I took them off and opened up the top carb, what a mess, not sure how it was even running, I took pictures to document things but this is a rebuild for sure, not like I didn't think that anyway. The top cab and lower carb seemed to be gummed up pretty good, not sure of the center carb yet. I am sure this will fix the issue. Now all I need is one of those orifice screwdrivers and I'll have it made. Going to pick up some carb cleaner (1 gal) and a spray can too, and a parts brush, will soak them overnight and blow them out with some compressed air. How does anyone let things get so bad...a little routine upkeep and you would never have this issue. 3 rebuild kits to order, including floats since I am not sure if they are supposed to be black.

 

[tashasdaddy]

Re: 83 Evinrude 75hp will not run without w/o choke

it's 33 in Jax, Fl this morning. here's some help on setting the needles,

http://forums.iboats.com/showthread.php?t=167352

 

[tashasdaddy]

Re: 83 Evinrude 75hp will not run without w/o choke

here's the tool
http://i155.photobucket.com/albums/s311/frankr_photos/FixedJetScrewdriver.jpg?t=1176028992

 

[ezeke]

Re: 83 Evinrude 75hp will not run without w/o choke

Don't want to start an arguement, but it is very important that the idle setting on your model be the same for each carburetor and that they be set according to the specifications in your model-specific service manual.​

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

I took the carbs off and soaked them. Seloc shows a needle valve but there is none. I have three orifices (Seloc does not show this on type I single throat carbs), I am thinking the other one is the mid range orifice. I hope the rebuild kit will come with one of those as well.

I did clean the carbs and thanks to tashasdaddy for the tool specs, I made one today and it worked 100%, now I have one forever. One thing for sure, to do the best possible job you should really take the orifices out, even after soaking for about 2 hours there was still junk in the orifices when I pulled them out, the hi speed was the worst as you would expect, since that is where the fuel stayed to get gunked up.

Since there is no needle valve I am assuming the fixed orifices do the job and I don't need to worry about anything else. There are no adjustments on the carb, besides changing orifices (but why do that). Does anyone have any experience with this type of carb? Am I right that the third orifice is for mid range? I am checking the marina tomorrow to see what they get for a kit with floats but the floats will clean up if they don't have them.

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

Does anyone now what size orifice goes where? I took them out and placed them in the cleaner one set at a time so I had a built carb in place as a reference. I took these out but now I am questioning my positioning. I knew I should not have done this on Easter Sunday, everyone was over and my wife was wondering where I was. Had to come up for air anyway, atht chem dip is bad. There are two that are almost the same, one for the idle which I believe is a 67 and the mid range that looks like a 59. These are the numbers stamped on the orific themselves.

 

[ezeke]

Re: 83 Evinrude 75hp will not run without w/o choke

Go to the BRP parts diagram for your specific model. The diagram for your carburetor will list the orifice numbers:

http://epc.brp.com/default.aspx?brands=ej&lang=e

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

Thanks ezeke my positioning on the parts bench was correct, and BRP confirmed this. Now just waiting for the gasket sets. I have a trip next week in Vegas (trade show) so I'll just have to wait to get this buttoned up, a week from Friday,

Thanks to all, for the help, I really could not have done it without all the good advice.
I'll let you all know how it works when I attempt to start her in about two weeks.

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

Got the parts in and everything went together without an issue, I got the parts from iBoats, trying to support the site that has this great forum.

It has been raining here so I can't get out there to install the carbs and fire her up. I know it will go since the carbs were so bad.

I do have another question, the engine that I am replacing is a Tohatsu M70A. The Toha has a Tach, can I connect the Evinrude to the Toha tach? If so, how?

 

[ezeke]

Re: 83 Evinrude 75hp will not run without w/o choke

Print the pdf tach instructions from Teleflex.
http://ww2.tflx.com/PDF/99320.pdf

 

[Quick-man]

Re: 83 Evinrude 75hp will not run without w/o choke

Thanks ezeke I'll take a look.
Also the update on my carbs that I cleaned. I took 2 hours off from work this afternoon since I installed the carbs last night. I connected everything and gave it a shot of prime and Ding Dong everything started to run, ah, the smell of an outboard. It idles great and revs like it should. I only had the muffs on so I can't really tell how she will run at WOT. What a difference clean carbs make. Now to mount it on the boat and get on the water. This weekends focus is doing all this. And getting that Tach connected.

What a great site this is. I have been trying to help others with small things that I think I know about.

Thanks to all for your help, great advice, great links, and a great community, boating, more fun than you know what to do with, even when things don't work quite right.