My OHV155 204508E motor will start with starting fluid and idle as long as the choke is all on the way. When it heats up it will stall. When it is moving under load it will stall out. The mower has set outside for two or more years uncovered. I have verified the solenoid on the carb opens and when I pull the bowl the float and seat seem to let fuel in properly. The mowing season will be over by the time I get all this ironed out, fortunately this one of two riders I have. If anyone has an idea it would be appreciated.
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Time to clean the carb and replace the float needle and seat. Here is the procedure I use, but your fellow Kentuchian Fish, will tell you to adjust the valves. You may want to take it to him if you can find him.
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.
No, I would just suggest he drains out all of the old nasty gas and water out of his fuel system, especially the carb, and replace with fresh fuel, no need to replace the needle/seat unless the carb is flooding, or the needle is stuck, but since it will start and run on choke, the draining is likely all you need to do, and get someone to hold the bowl in place while you take the nut/jet
out and clean it thoroughly, and with some small wire, clean out all of the little passages in the side of it out. Re-assemble and see if she will run for you.
