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is their a secret to cleaning carb ive been working on small engines for a while but sometimes they just wont work i use carb and choke cleaner and compressed air .




also i have this carb i cleaned and got working but it just pours gas through went and primer hole (when not connected ) (float is not stuck) it is a tecumsuh adjustable carb
 
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Tecumseh Carbs are fairly simple units. The float model carbs are easy to rebuild/repair.. Before you start, one thing you will need is a repair manual. (I have free pdf's for members).

There are some common problems with carbs 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 emolltion tube is stuck. This tube is sealed into the body of the carb during manufacturing and can not be replaced. The carb 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 corrision 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 bown nut) out the three holes that need to be cleaned are exposed. Using a piece of soft tag wire clean these holes. Now cdlean the complete carb with carb cleaner.
Re-assemble the carb. Make sure that the needle valve seat is completly 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
 
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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 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 in to 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.
Good luck
 

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One more thing on tecumseh LVC and EVC (late "90`s' and newer) that no one would know unless they took "update classes". Thread sealant or "locktite" must be applied to the front left air cleaner bracket screw to avoid leakage. The hole for this screw is drilled completely through to the primer chamber. This is not mentioned in the repair manuals.
 

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Most any business selling Outdoor Power Equipment or any Tecumseh dealing should have tecumseh manuals for sale.

If your engine has "over head valves" make sure you ask for an OHV repair manual.
 

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deken said:
Tecumseh Carbs are fairly simple units. The float model carbs are easy to rebuild/repair.. Before you start, one thing you will need is a repair manual. (I have free pdf's for members).

There are some common problems with carbs 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 emolltion tube is stuck. This tube is sealed into the body of the carb during manufacturing and can not be replaced. The carb 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 corrision 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 bown nut) out the three holes that need to be cleaned are exposed. Using a piece of soft tag wire clean these holes. Now cdlean the complete carb with carb cleaner.
Re-assemble the carb. Make sure that the needle valve seat is completly 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


I'm trying to repair my carb, could you please give my the PDF for a Tecumseh HSK600 engine.
 

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check pick up tube make sure no rust in tank clean pickup tube.. carb cleaner and GAS SOAKEd toothbrush... if taht doesnt work dip it in carb cleaner / stabil for a day or 2 then try it
 
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