Repairs Carburetor Problems

[bryantsplace1]

Had problems with mower starting this year and it appeared to be carburetor.
Removed carburetor and cleaned, reinstalled about a week ago and just go the chance
to try and start engine. It started up and ran great for about 5 mins and them it started
running like the choke was pulled completely out. Kept messing with it until it shut down.
Acted as if getting to much fuel with black smoke coming out exhaust. I have been working
on another mower also adjusting valves and still having issues there also. It also
may be a carburetor issue there. Any help would be appreciated. Thanks

 

[motoman]

Jammed open inlet valve (needle) or bad float setting, or bad float, or choke butterfly on and not released?

 

[Rivets]

Time for a very good carb cleaning and replacing the float needle a seat. Follow this procedure.

Needle and seat replacement

Remove the carb, and then remove the float bowl. Check the float bowl jet (which is the bowl screw) and make sure the jets both horizontal and vertical are clean and open. Tip the carb upside down and remove the float pin and float with needle attached. Look in the float needle passage and you should see the red float seat at the bottom of the passage. This is where a #5 crotchet hook would come in handy as you need to remove this seat. If you have no hook, but compressed air, you can blow through the fuel inlet and try to pop the seat out. Put your thumb over the passage to prevent the seat from flying who knows where. No air or hook try bending a stiff paper clip to dig the seat out.

I would either give the carb a good 24 hour soaking or have it ultrasonically cleaned at this time.

With the seat out clean the passage way with carb cleaner. Now you must find a drill bit slightly smaller than the passage way, to be used to press in the new seat. Apply a very, very small amount of a very light lube to the new seat. 3-1 oil or lighter, to help seat it better. Carefully insert the new seat in the passage way with the rings on the seat down toward the carb body. Slowly and carefully force the seat down with the back end of the drill bit. Once it is seated, check to see that it did not flip and the rings are up. *Next check to make sure that the float does not have any liquid in it. *If it does, replace. *If everything looks correct, attach the new needle to the float and install with the float pin centered. It everything is correct, the float should seat level to the carb body, when looking at it upside down. If everything looks good reattach the float bowl, making sure that both the bowl gasket and the nut gasket seal properly. Reinstall on the engine and test unit. Remember to have patience and take your time. Good luck, but I don't think you'll need it.

PS: *On the side of some Tecumseh carbs you will find a plastic cover. *Under this cover will be an idle jet. *Remove it and check to see that the jet is open both horizontally and vertically. *You should be able to push the old float needle wire through the vertical opening.

 

[bryantsplace1]

Thanks for the reply. I will repull carb tomorrow. I guess I need to order a rebuild kit also.
I have another mower with possible carb problems. Maybe need to order 2 kits.
Thanks for the help.