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How to rebuild a Tecumseh Carburetor

You can read this article at Jacks Small Engines as well.
Tecumseh Carburetors are fairly simple units. The float model carbs are easy to rebuild/repair. Before you start, one thing you will need is a factory repair manual.
There are some common problems with carburetors that should be checked before you start a rebuild. Many times the following items will correct the trouble your engine is having. You will still need a repair kit to replace certain gaskets and seals that should be replaced whenever disturbed.
One of the more common problems is the flooding of the carb. If this is your complaint check the float first. Remove the float bowl, float pin and remove the float. Be careful that you do not loosen the float needle valve. Now shake the float and listen for gas inside. If the float sloshes, replace it with a new one. Replace the float needle valve seat and adjust the float per the factory manual. Replace the float bowl gaskets.
If you are experiencing performance problems and suspect the carb, you will have to remove it from the engine to correct the problem. After the carb is off the engine there is one thing you need to check before going any further. Remove the float as above. Now hold the choke and throttle butterflies so that you can shake the carb without them making a sound. Shake the carb and listen for it to rattle. If you do not hear the rattle, the emulsion tube is stuck. This tube is sealed into the body of the carb during manufacturing and can not be replaced. The carburetor will need to be replaced. Also if the aluminum body of the carb is corroded inside, any rebuild will only be a temporary fix. Once the corrosion has started it can not be stopped.
If everything checks out up to here, a rebuild and cleaning should fix the carb. However there is one more tricky thing you will need to do. You must remove the welch plug on the side of the carb. This can be done by driving a sharpened small punch or screw driver through the plug and popping it out. Take extreme care when doing this procedure. There are two jets cast into the carb body under this welch plug. If you damage them the carb will have to be replaced. With the welch plug removed and the main jet(in the bowl nut) out the three holes that need to be cleaned are exposed. Using a piece of soft tag wire clean these holes. Now clean the complete carb with carb cleaner.
Re-assemble the carb. Make sure that the needle valve seat is completely down into its bore. After driving in the new welch plug, paint it with finger nail polish to seal it. Adjust the float height using a #4 twist drill as directed in the repair manual.
Now that your carb is rebuilt don't drop the ball on the 90 yard line. Replace the gaskets between the carb and the engine, and the carb and the air cleaner. One common mistake made is to fail to replace the fuel line between the carb and the fuel filter/tank. If the carb was full of dirt or varnish the fuel line will also be. Plus when the carb or fuel line is removed, the inside of the hose usually is damaged. Small fragments of hose materials can break loose and flow into the carb. This will ruin the job that you just completed.
After the carb is remounted to the engine it must be adjusted correctly. You will need a repair manual to do this. Remember that the idle circuit must be adjusted first. Without the idle circuit working correctly you will never get the main jet adjusted correctly

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1 Answer

Where is the fuel pump ?


Mostly small engines needing to be used at a variety of angles will have the fuel tank under the engine and fuel will be pumped into the carburettor.
A traditional carb would be useless and dangerous for this sort of machine as the float chamber must be vented and the float needs gravity to exert a more-or-less downward influence.

The gravity-defying carb is a fairly simple fuel metering device that has a diaphragm type fuel pump integrated into the body of the carb which is operated by connecting it to the fluctuating depression of the 2-stroke engine crankcase via a small drilling close to the intake port.

Feb 03, 2016 | Garden

1 Answer

I have a Tecumseh 5.5 Enduro Power Washer and need a replacement carb for it.


If the carb is still intact, you may just want to rebuild it. Parts are easy to find and inexpensive.

Jul 11, 2015 | Tecumseh Garden

1 Answer

float in carb.


Hi Stan,It sounds like you are missing your float needle. There is no reasonable explanation for it to disappear if the float was not removed.The float needle is typically made from aluminum with a black conical gasket tip to create the seal when the float is in the raised position to stop the flow of fuel. They are fairly inexpensive to replace. Seeing that your generator is a Powermate 5000, if it is an older unit using a Tecumseh engine you will have to be very specific with serial and model numbers, since Tecumseh has gone out of business. Replacing the float needle is fairly easy. Some carburetor bowls are formed with an uneven bottom to allow proper travel of the float and they must be re-installed in the correct orientation. If the bowl is round and completely flat on the bottom the orientation doesn't matter. After the bowl is removed the float needs to be removed also. Where the float hangs on its hinge there is a stainless steel pin that needs to be removed, some carburetors have a nub on one side that allows the pin to be removed in only one direction. A finishing nail that is smaller than the pin will push it out with little effort. On the top of the float as it would be oriented in its installed position there will be a horse shoe shaped receiver that the float needle slides into, there also might be a small spring in the replacement, be careful with this spring it is easily damaged and easily lost. The float needle is placed into the receiver on the float, then carefully take the assembly and slide the float needle into the orifice while the float is lined up to go back into its hinge. Align the float to receive the hinge pin and slide it in. Make sure that your bowl gasket is in good condition and replace the bowl keeping in mind if the bowl is formed for float swing travel. Add a little gas and check for leaks. If leaks are present the causes will be bad gaskets either on the top of the bowl or the bottom by the nut. Another cause could be that the bowl is rubbing on the float and keeping the valve open, loosen the nut and rotate the bowl until the float swings freely then re-tighten and check for leaks. Last but not least you have the wrong float needle and it is not long enough to seal correctly when the float has risen to the full position. Good Luck,Michael Burke

Nov 26, 2011 | Coleman Powermate Powermate 5000W...

1 Answer

tecumseh carb leaking gas out of a hole on the side of carb


BAD NEEDLE OR NEEDLE (GUMMED UP OR VARNISHED )SEAT OR COULD BE THE FLOAT. SHAKE THE FLOAT IN YOUR HAND YOU CAN FEEL AND HEAR GAS INSIDE IT = BAD FLOAT ... NOW FOR THE CURE AFTER CLEANING YOUR CARB .(SPRAY CARB CLEANER OLD TOOTH BRUSH) WAS THAT FUN?? DON'T WANT TO DO IT AGAIN ?? BUY YOUR GAS FROM YOUR LOCAL MARINA , USE IT ON ALL YOU SMALL ENGINES. IT HAS NO ALCOHOL. = EATS RUBBER... NOW THATS HOW YA FIX IT .. DID I HELP ? PLEASE VOTE .. THNKS J

Nov 03, 2009 | Heavy Machinery

2 Answers

Despite changing the sparkplug and proper choking, etc. no start


The most likely culprit is a clogged carb - a very common problem indeed on Tecumseh motors. Pull the carb off, open it up, spray everything with cheap carb cleaner (especially the bottom "bolt" that hold the float cover making sure it sprays out of at least two sides as that "bolt" is also the jet), make sure everthing lines back up as you pulled it apart and now try to start it up again! Bet it works, I see it all the time on small engines left with small amounts of gas in the system. Good luck, and I hope that gets ya runnin!

Mar 12, 2009 | Troy Bilt, Tuffy, Rear - Tine Tiller, 4.0...

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