Choke Issue '01 Mercury

[Breal]

The float in my 9.9, 4 stroke 323 cc Mercury carburator was leaking so I took it home and cleaned it and reinstalled it. Although the engine starts and it no longer leaks, when I push the choke in after it has warmed up, the engine stalls. I adjusted the carb so it would open and close all the way, but it obviously cannot reach max speed since I cannot push the choke back in.
I adjusted the accelerator by feel since I don't have a tachometer, but I don't believe my issue is the accelerator, or idle speed. I adjusted the WOT Wide Open Throttle stopper to specs which is less than 1 mm. Nothing is sticking from what I could tell.
Anyone experience similar issues, know a fix or have any suggestions?
I did not rehaul the carburator, just cleaned it.
Your help is appreciated.
Thank you
Bernard

 

[j_martin]

Re: Choke Issue '01 Mercury

I used to train field engineers. (mainframe computers) The one thing that was hardest to get them to understand was this:

If you walk up to a running machine
and you do something to it
and it now does not run.
DUH IT'S WHAT YOU DID.

Sorry for the high impact, but you must have made a mistake. Take the carb back off and find out what you missed. Usually it's something like the gasket under the seat, or float adjustment, or a missing small gasket or plug.

hope it helps
John

 

[Breal]

Re: Choke Issue '01 Mercury

Sorry, It was not that. I had a diagram of my carburator and engine. Didn't miss any parts. The dissasembly and reasembly was pretty straight forward
Of course it was something I did to it. That's what the big mistery is here.
You r right about un & reinstalling it though, but...
I don't mean to sound unappreciative, but w/ your advice, anyone can be a
mainframe computer field engineer teacher
Maybe the carb should be rehauled.
Any thoughts

 

[Silvertip]

Re: Choke Issue '01 Mercury

If the engine will not run with the choke OFF, then it is running lean which also means it is not getting fuel. You either did not set the float level correctly or you dislodged something in the carb during the process. We can't see what you did so you will need to right your wrong.

 

[j_martin]

Re: Choke Issue '01 Mercury

Sorry, It was not that. I had a diagram of my carburator and engine. Didn't miss any parts. The dissasembly and reasembly was pretty straight forward
Of course it was something I did to it. That's what the big mistery is here.
You r right about un & reinstalling it though, but...
I don't mean to sound unappreciative, but w/ your advice, anyone can be a
mainframe computer field engineer teacher
Maybe the carb should be rehauled.
Any thoughts

Like I said, it was the hardest thing to teach. You're supporting the thesis.

Not saying you're dumb, or careless. You just missed something. After all, do you overhaul carburetors for a living?

hope it helps
John

 

[CharlieB]

Re: Choke Issue '01 Mercury

If this is a 4 stroke

The 9.9's have some very small idle air/fuel passages in the top of the carb throat just before and after the throttle blade, these holes are VERY small and apt to clogging from even the smallest of carbon particles/dirt/fuel residues.
You will find access to these holes by removing the steel plate screwed to the top of the carb. Make double sure that they are clean and clear, spray a good solvent thru each hole while observing the stream out the carb throat.

Also, using a small bit,drill a hole and install a self tapping screw to pull and remove the carb idle jet block off plug, carefully turn in the jet while counting turns until very lightly seated, then remove for cleaning, reinstall at the original setting.

Also ensure that the accelerator pump and check valve are clean and functioning.

 

[Breal]

Re: Choke Issue '01 Mercury

Not saying you're dumb, or careless. You just missed something. After all, do you overhaul carburetors for a living?

hope it helps
John

Wow! I wonder if your high number of posts were as usefull and insightful as the ones you've posted here. I ain't mad at cha bro, I just feel sorry for your students. I do not repair carburators for living. If I did, I wouln't be here asking for advice. Does that make sense?

Silvertip, reading your post reminded me that I was supposed to measure the float height, which I completely forgot. I'll take a close look at that.
Thank you!

CharlieB, I used carb cleaner to clean the carb. I saw these tini holes and believed that they were clean, but will look at them again.
The self tapping screw thing went over my head. I know that there is a main jet and a pilot jet. I'm not sure where the idle jet block off plug is. Are you refering to the pilot jet plug? Could you please explain it as if I was a third grader so I can understand better. What is the purpose of the self tapping screw? Sorry, I'm really new at this.
Will check the accelerator pump and valves as well.
I really appreciate your insight. Thanks
Bernard