How to clean a motorcycle carburetor?
Most people may think this is a difficult work, however, it is not
true. In fact, as long as you grasp a few important principles and
basic cleaning steps, can you do a perfect carburetor cleaning job.
Well, this paper will tell you how to properly clean your carburetor.
Generally, the first step is to remove the carburetor from the vehicle and drain most if not all the fuel from it, you can also remove the fuel lines and vent lines at this time. Then, flip over the carburetor and remove the bowl, which is attached to the carburetor with usually 3 or 4 Phillips screws on the bottom. Once removed, you can now see the internals of your carburetor. If the inside of the bowl is dirty, you know that you carburetor inside are likely to be as well.
Now that you are inside the carburetor, you can remove the float. It is held in by the pin, that can be pushed through and the float will lift out. You can see at this point if the float isn't moving freely, you could have a sticky float resulting in excessive flooding of the engine. So make sure this is working freely on re-install.
Well, it’s time to clean out your jets. First you can remove the high speed jet (the one with the slot on top). It is removed with a flat screwdriver. Once removed you can look at it against a light and see if it is clogged or not. If this is you can soak it for a minute in engine degreaser and then hit it with compressed air to blast out the debris. This may need to be done a few times until fully clear of dirt. Once cleaned, re-install it and make sure not to tighten excessively. The next is the main jet. It is usually the one sticking up higher, and usually a hex headed 1/4" brass jet. You need turn it out of the carburetor and inspect for a clogged passage. The same as the high speed jet, you can soak it in degreaser and blast it with compressed air as well. Repeat that to make sure it is cleaned right out. Look down the passage where the main jet came from and blast air down to clean it out as well. Now you can re-install the main jet.
Check now to make sure your choke lever and butterfly are working properly and not sticking or hesitant. Remove linkage and lubricate to help in ease of operation. Clean intake of the carburetor so no debris gets into the engine.
Then, you can blow the compressed air through all passageways in the carburetor to make sure no more clogs are in there. Do all the jets, intake ports, idle ports, overflow ports and where ever you can blow the air. Blow the whole carburetor out to loosen and remove all the tiny particles of debris.
OK, the internals have been all cleaned out, you can now clean out the bowl and underside of the carburetor to make sure no more dirt gets back through your freshly cleaned carburetor. You can soak the bowl in some degreaser to loosen some stuck on dirt. Be sure to wipe and clean all dirt at this stage so that no more gets inside. This will later help in less problems with clogged up internals.
And now, re-install the float and pin. In this stage, you should spray a little lubrication on the pin and where it meets the float will help so much. Push the pin through the post coming from the carburetor and through the float mount and back through the other side post. No need to fasten it there because once the bowl is installed it will hold it all together.
If you have done all these, you can re-install your bowl and fasten it with three Phillips screws, make sure not to over tighten and strip these. Once re-installed, check final operation of the choke and blow last bits of dirt away. You can also hear the float moving if you shake it easily. And once all cleaned, you can install your fuel lines and vent hoses. Then, you have done the cleaning.
Generally, the first step is to remove the carburetor from the vehicle and drain most if not all the fuel from it, you can also remove the fuel lines and vent lines at this time. Then, flip over the carburetor and remove the bowl, which is attached to the carburetor with usually 3 or 4 Phillips screws on the bottom. Once removed, you can now see the internals of your carburetor. If the inside of the bowl is dirty, you know that you carburetor inside are likely to be as well.
Now that you are inside the carburetor, you can remove the float. It is held in by the pin, that can be pushed through and the float will lift out. You can see at this point if the float isn't moving freely, you could have a sticky float resulting in excessive flooding of the engine. So make sure this is working freely on re-install.
Well, it’s time to clean out your jets. First you can remove the high speed jet (the one with the slot on top). It is removed with a flat screwdriver. Once removed you can look at it against a light and see if it is clogged or not. If this is you can soak it for a minute in engine degreaser and then hit it with compressed air to blast out the debris. This may need to be done a few times until fully clear of dirt. Once cleaned, re-install it and make sure not to tighten excessively. The next is the main jet. It is usually the one sticking up higher, and usually a hex headed 1/4" brass jet. You need turn it out of the carburetor and inspect for a clogged passage. The same as the high speed jet, you can soak it in degreaser and blast it with compressed air as well. Repeat that to make sure it is cleaned right out. Look down the passage where the main jet came from and blast air down to clean it out as well. Now you can re-install the main jet.
Check now to make sure your choke lever and butterfly are working properly and not sticking or hesitant. Remove linkage and lubricate to help in ease of operation. Clean intake of the carburetor so no debris gets into the engine.
Then, you can blow the compressed air through all passageways in the carburetor to make sure no more clogs are in there. Do all the jets, intake ports, idle ports, overflow ports and where ever you can blow the air. Blow the whole carburetor out to loosen and remove all the tiny particles of debris.
OK, the internals have been all cleaned out, you can now clean out the bowl and underside of the carburetor to make sure no more dirt gets back through your freshly cleaned carburetor. You can soak the bowl in some degreaser to loosen some stuck on dirt. Be sure to wipe and clean all dirt at this stage so that no more gets inside. This will later help in less problems with clogged up internals.
And now, re-install the float and pin. In this stage, you should spray a little lubrication on the pin and where it meets the float will help so much. Push the pin through the post coming from the carburetor and through the float mount and back through the other side post. No need to fasten it there because once the bowl is installed it will hold it all together.
If you have done all these, you can re-install your bowl and fasten it with three Phillips screws, make sure not to over tighten and strip these. Once re-installed, check final operation of the choke and blow last bits of dirt away. You can also hear the float moving if you shake it easily. And once all cleaned, you can install your fuel lines and vent hoses. Then, you have done the cleaning.
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