Carbs cleaning question

[matt194]

I have read the post on how to clean the carbs and I have read my manual but I am still not sure of what exactly to do. I have posted 2 pictuers with my questions on the pictures. Please help. Oh yea its a 79 evinrude 115hp.

 

[F_R]

Re: Carbs cleaning question

Picture #1, those tubes are the main nozzles and do not come out, so don't try. They are the path for the high speed fuel flow into the venturi but they are not the high speed metering jets. The jets are in the carb bowl, deep in the holes behind the hex-headed drain plugs.

Picture #2, those are called core plugs and cover a cavity with several tiny holes leading into the carb throat near the throttle plate. The idle fuel goes through those tiny holes. Should you remove them? Depends on whether there is any dirt in those holes. But how do you know unless you look?

The idle metering jets are in the holes behind the screws that you removed from the outside, to the right and left of the core plugs. Don't mix up any of the jets, put them back in the same holes you got them out of.

 

[mikesea]

Re: Carbs cleaning question

I have rebuilt countless carbs and unless the carbs were beyond belief in dirt,I didnt remove the core plugs,Your carbs appear cleaner than some Ive done without removal.You should remove all plastic and rubber,get a carb solution bought at local auto store and soak the carbs at least a few hrs.i then soak in hot water with dis washing soap,then run hose for rinse ,get a can of aerosol carb cleaner,if you have compressed air,blow dry with all passages getting a good blast,follow with the carb spray,you can likely reuse the float,but I like to change the needle ans seat ,the seat will unscrew,the bottom part of the carb has 2 brass plugs,behind the pluge ,inside the bowl are jets that are screwed into the casting,you need a screwdriver that is small but the head of the blade needs to be thicker than a normal screwdriver that size is.There is a special jet driver for removal,but grinding a small driver down and grinding blade til it becomes thicker will do it.That said,iff you take a pipe cleaner ,you can clean the jest while in place if removal just dont work out,holding up to a lite should let you see if passages are clean,if your gaskets seem ok,you can reuse them,the newrnes are rubber and allow for reuse

 

[matt9923]

Re: Carbs cleaning question

after cleaning carb on Johnson 33hp what should i set the jets to 1/2 turn out? whats a good place to start cause their all off now.

 

[mikesea]

Re: Carbs cleaning question

Matt,you should start a new post.Its a differnt?and different eng.BUT,you should set the top low speed 11/2 turns out from all the way in/And the high speed at 3/4 of a turn.That is a starting point.When running wot ,slowly set the hi speed til optumum speed is achieved.If you need to turn it it for more speed,I like to ,once fastest is found,give it a bit more of a turn out to richen for lubrication.On the low speed,you want to adjust so you get a decent idle in gear,but not so high it revs in neutral banging into gear.Im assuming you have no tach ,as the 33 hp is from around 1967 ,just a gess

 

[matt9923]

Re: Carbs cleaning question

Im assuming you have no tach ,as the 33 hp is from around 1967 ,just a gess

Yes no tach but its a 1971 or 70 33hp. Thanks

 

[blockyer@persona.ca]

Re: Carbs cleaning question

I'm looking for a diagram to fit hoses on front of oil injected Evinrude 115 1996

 

[mikesea]

Re: Carbs cleaning question

Blockyer ,you need to start a new post.I inly found you because I have oposted here months ago.Just look for the new post sign.BUT,you can also do a search on the forum for "HOSE ROUTING"

 

[captmoose]

Re: Carbs cleaning question

I have a 1991 40 hp Johnson J40TLEIA. I just rebuilt the carbs following the shop manual and threads here which were a great help. I never would have had the nerve to remove the plug were it not for your advice & photos. It was easy & recommend it to all as long as you have the replacement parts.

* Do not try to pry the plugs out from the edge. I used a drill to make a hole in the center and then pried out the plug using an awl. Very easy to do & make sure the shavings are removed.

I have not reinstalled the carbs yet, but I have put them back together. My carbs do not have a slow speed idle needle. There is a slow speed jet, but it was set all the way in and does not appear to be adjustable. It is only accessible when the carb is opened up.

The only adjustment I see is the brass idle adjustment on the side of the carb near the linkage (Low speed mixture needle). Is this correct? I used an aftermarket rebuild kit & the diagrams they have also show a slow speed needle. The kit was the right one for my engine and did contain the right parts. I assume the kit is for different variations of the same carb? I just rebuilt it with the new parts the same way it came off. Is this right for my engine? It looks like I have a typical type "A" one piece carb?

Also, when it says not to disturb the linkage adjustment, I wonder if I did that out of necessity? There was a linkage bar between the carb linkages which just popped out of a plastic retainer on each linkage. One carb also had a plastic bearing/roller which needed to come off to avoid soaking the plastic. The screw holding it on attaches to a 90 degree arc piece on the linkage & the hole it passes through is elongated for adjustment back & forth. Where do I set this bearing or how do I check if it is set right?

Thanks in advance.