Carburator Question with photo

[ozenine]

I am having some issues with the 40 HP 1993 Force. It would not idle - dies imidiatelly, would not run - after maybe 30 sec it dies down. Has a hard time starting, have to crank it really hard.

So i decided to clean the carb. I took it apart and it appears to be extremely clean inside. So there was nothing to clean.

Then I looked at the idle tube and here is what i noticed. Manual says that it must touch on the bottom side of the main nozzle or the motor will run extemely lean. But on my motor idle tube extends below main nozzle (see picture) I would say it is 1/8-3/16 of the inch pass the bottom of the nozzle.
It does not say in the manual how much should it be inside of the nozzle (or even should it be?). Also I am not sure what to do, is that idle tube too long? Should I remove and cut it? how much should it be inside of the nozzle?

I am aslo afraid of damaging the tube when i will be punching it out.

Thanks for the opinions....

PS. What should be the orientation of the little hole in the middle of the idle tube? Currently it is facing side of the carb. Is that right?

 

[jerryjerry05]

Re: Carburator Question with photo

It looks like the tube has come loose.Will it come out? You need to put it back up in the jet.The jet has to be removable as that is usually where it gets dirty.J

 

[Josh P]

Re: Carburator Question with photo

my idle tube was in the same place on my 91 120hp, i thought the same i tried to remove it and bent the end up a bit so i just expanded it back open with a small phillips and left it. im having ignition problems right now so no telling if its lean or not

 

[sidenberg]

Re: Carburator Question with photo

Did you check the seats and needle? Even though the bowl looks clean you could still have a blockage inside the passageways somewhere. A thorough cleaning might just do the trick. I don't really get why it is important where the idle tub is located within the main jet. As long as it is in the jet and can suck fuel you would think it should work okay. Also the manuals are not always accurate on every detail for every engine. It seems that there are quite a variety of carburetors and configurations used on these Force motors. The carbs on my 1987 125 HP are nothing like the diagram shown in Clymers.

 

[ozenine]

Re: Carburator Question with photo

Jerry: No, it does not feel loose. My understanding is taht it should be installed from top, so if it ill be loose it should go up, not down. Said that, it is possible it was not installed properly.

Josh: Thanks for clarification.

Sidenberg: Thanks for the advice. I do not want to sound stupid, bu t does niot look like this carb has a needle. I was surpised myself, cause before I worked with carbs only with needles. Maybe am not sure what do you mean by needle and seats.

Also, how do I clean internal passages? I read somewhere about compressed air, but have no compressor. I can try with bicycle pump with narrow nozzle.What do you think?

 

[sidenberg]

Re: Carburator Question with photo

http://www.boats.net/parts/search/M...RBURETOR - 40 H.P. E065372,E093699/parts.html

I am sure your carburetor has a needle. It is controlled by the float and I can see it in your photo. The link above will give you the diagram for your carb. To clean you need to remove the float and needle and soak in carb cleaning solution. Then blow out with compressed air all the passages. Good idea to remove first any rubber seats or rubbers needle tips if you have them as some carb cleaners will eat them up. Sounds like you should invest in a Clymers manual as well.

 

[ozenine]

Re: Carburator Question with photo

That is the Clymers manual on my picture

I did not realize that you refered to the inlet valve needle, sorry.

I will try to find all passages today. Hard to know where they are, since they are not shown in the manual. Also interestin that your link does not show the idle tube.

 

[sidenberg]

Re: Carburator Question with photo

Yea, I do not no why the idle tub does not appear in the diagrams. Mine does not either. I quess maybe it is part of the main nozzle or it is not a replaceable part. But my guess is your idle tub is probably okay and is supposed to be the way you have described. Again these diagrams and photos in manuals are not always exactly correct for all engines. I cleaned out my carbs by removing the floats, inlet needle and seats and soaking the carburetor for a day in carb cleaner or sea foam. Then I blew compressed air through the jets and passages. I replaced all my deteriorated rubber seats/needle tips with new ones that are more resistant to the ethanol fuels. I am not sure what type of rubber you have in your 1993 model but you might think about that while you have it apart.

This could be the fix for your problem but then again it could be something else? Fuel pump maybe?

 

[ozenine]

Re: Carburator Question with photo

Thanks Sidenberg. I will do that. Rubber seems to be in decent condition, but I will inspect it later this week. Mybe it is the fuel pump, I tried turning motor by the starterand fule is going but it more fast dripping then flowing, so will have to check it out.