1st Time Carb Rebuild - Questions

[OptsyEagle]

Hello: I have a 1975 9.9Hp Evinrude and I am rebuilding the carb after my engine tended to hesitate at high throttle like the fuel was being intermittently restricted (when at WOT it would lunge and slow down and lunge again), and it didn't idle well.

I have the carb off and have some questions about some of the parts in my kit. I have a plastic piece that looks like a small little squared funnel, about 2mm in diameter. Is this the bearing (slow speed seat) and if so, am I supposed to shove it into the slow speed channel. I didn't seem to see one in there when I took out the needle. Would this create my running condition above?

Also, in my kit I have three little metal saucer type disks of slightly different diameters of about 7/16", 1/4" and 3/16". What are these for? The answer may go with my next question. Am I supposed to pop out the core plug and if so how and is there more than one. Mine seems to be glued in and I do not have any glue to put it back if I could get it out.

Lastly, when inspecting my slow speed needle with a magnifying glass, at times when my eyes gloss over (because it is so small) it looks like I might see some scratches, maybe even a slight bend, but then again maybe not. Would a defect that causes any real problems be something that would be quite obvious? I don't have another needle to replace it at the moment.

Thanks for your help.

 

[bigbob_FTW]

Re: 1st Time Carb Rebuild - Questions

Hello:
...Also, in my kit I have three little metal saucer type disks of slightly different diameters of about 7/16", 1/4" and 3/16". What are these for? The answer may go with my next question. Am I supposed to pop out the core plug and if so how and is there more than one. Mine seems to be glued in and I do not have any glue to put it back if I could get it out.

Use a tiny slotted screwdriver to get the old plugs out (drive the screwdriver gently thru the disk. When you re-assemble, put the disk in with the curved part facing you and use a small, square drift to seat the new disk in place.

 

[OptsyEagle]

Re: 1st Time Carb Rebuild - Questions

Do I need to glue these plugs after I get them in or will they stay on their own, plus I am not sure what you mean by a "small square drift"?

Does the slow speed chamber get that little plastic funnel like thing? It looks a little like a bearing but since it didn't appear that my carb had one when I took out the needle, I am not sure if it goes here.

 

[Walker]

Re: 1st Time Carb Rebuild - Questions

Do I need to glue these plugs after I get them in or will they stay on their own, plus I am not sure what you mean by a "small square drift"?

Does the slow speed chamber get that little plastic funnel like thing? It looks a little like a bearing but since it didn't appear that my carb had one when I took out the needle, I am not sure if it goes here.

Yes, that plastic funnel thing goes in the slow speed orifice. Look real close. I bet the old one is still down in there.

 

[OptsyEagle]

Re: 1st Time Carb Rebuild - Questions

Thanks a lot guys. I did have a bearing in my slow speed oriface. I used a 3 inch #8 deck screw, lightly screwed in just enough to grab it. I am certainly glad I asked. Thanks again.

 

[bigbob_FTW]

Re: 1st Time Carb Rebuild - Questions

Do I need to glue these plugs after I get them in or will they stay on their own, plus I am not sure what you mean by a "small square drift"?

Does the slow speed chamber get that little plastic funnel like thing? It looks a little like a bearing but since it didn't appear that my carb had one when I took out the needle, I am not sure if it goes here.

the object is to expand the metal. put the drift in the middle of the disk and strike with a hammer. this will expand it to fit the opening.