How to clean a carburetor
Today I will be instructing you how to clean an atv carburetor. I will be using a yamaha blaster 26 mm carburetor. However, most all atv carburetors disassemble the same and are cleaned the same way.
Step 1 - Disconnect from bike. Most of the time this will be by removing the cap, cable, and slide. There are also many hoses on the carb. They must all be removed. The gas petcock on the gas tank must be turned to off and the fuel line disconnected from the carb. The fuel overflow line must be removes. Any oil injection(2 stroke only) and idle lines must also be remove.
Step 2 - get you carb and cleaning supplies all together on your workbench.
------can of carb cleaner or brake cleaner
------small screwdriver, phillips and flat head
------paper clip unbent to a straight piece
------emery cloth, sandpaper, or a toothbrush(optional)
------compressed air(either air compressor or a can of compressed air)
Step 3 - turn the carb upside down and unscrew the bottom nut off of the carb bowl and remove the bowl. Take the carb bowl and spray the inside down with carb cleaner and clean up and residue left from old gasoline. A toothbrush will work pretty good. Spray the bowl with carb cleaner again and re-scrub if necessary. Continue until inside of the bowl is spotless. If "gunk" still remains, you may need to submerge the bowl in an open face can of carb cleaner.
Step 4 - Remove the hex jets with a screw driver from under the carb where the bowl was attached. Once removed, spray this part of the carb down with carb cleaner and scrub with the emery cloth or toothbrush. Repeat this step until no more residue is left. You may have to submerge in carb cleaner with the bowl. Next spray the carb cleaner through all the jet holes inside the carb. Cleaner should shoot out of other holes when this is done. Generously do this the all the jet holes and other orifices to clear their passages.
Step 5 - Take the jets you removes and run the unfolded paperclip through them to remove any dust and dirt obstructing its passage. Next, spray the inside passage with carb cleaner.
Step 6 - Spray the whole carb down with carb cleaner, inside and out. Every hole you can find and especially inside the bore and slide area. Pay careful attention to bowl area and jet/jets area when doing this second spray down.
Step 7 - Shoot the whole carb down with compressed air. Spray the bore and slide out. Spray the bowl and under side of the bowl. Spray the jet orifices and jets down very well.
Step 8 - re-install jets with the screwdriver. Replace carb bowl gasket if necessary. Screw bowl back onto carb. Re-install carb on the bike, re-connect all the lines previously taken off, and test for proper operation. If you notice any leaks around the bowl to carb mating surface, you may need a new gasket or some silicone sealant to seal the two together.
This process is fairly simple to even the most novice of mechanics. Simple knowledge of basic hand tools and experience working with mechanical devices will make this task even easier. This process can be done in as little as 20 minutes (as long as no soaking is required) by a DIY mechanic. If you take your time and do not rush every step, you too can complete this task correctly and in minimal time.
Regarding the soaking of carburetor parts, you will want to buy the liquid carb cleaner that comes in a paint like bucket. Once you open the can , suspend the carb parts on a stir stick or wrench with wire and lay the stick over the edge of the bucket submerging the parts. Now you can let the parts soak for a while. I suggest at least 12 hours, and if possible an overnight. When submerging the parts, try not get your hands in the carb cleaner, it can irritate your skin and dry it out. Also, its not advised to be exposed to the fumes of the carb cleaner for extended periods. Position the buck of cleaner and parts in a well ventilated area.