Difficult "First Starts" of the Day

cjac

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Was given a Tecumseh 4.25hp (LEV100 340018C) pushmower. It is difficult to start (first start of day or cold start). After priming 6-7 times it will fire and run 1-2 seconds then quit. Repeated priming and it continues to do the same. Very frustrating. Only when I prime again during the 1-2 second period can I finally coax it to keep running. After the engine warms up it will restart without issues. I cleaned the carb and gas tank (installed new needle, seat, bowl gasket), cleaned holes in the bowl nut, changed the oil, new spark plug, cleaned the air filter. Checked the primer bulb for cracks/holes but none to be found. Completely out of ideas what to do next. Help!
 

Rivets

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Time to rebuild the carb and replace the needle/seat plus intake gasket. Needle/seat part number 631021B, sorry don't know the gasket number, they have 3 different ones. Follow this procedure, and you should be able to solve your problem.


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.
 

cjac

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Thanks for the reply Rivets! You provided very detailed and helpful info.
 
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