The carburetor is the most common problem area in all small engines. The carburetor is where the fuel mixes with the air to be burnt. Carburetors are on almost all types of combustion engines. When an engine sits for a long period of time without being ran, the fuel will start to break down. Make sure you replace the fuel in your tank before you start your engine after cleaning the carburetor otherwise you will just recreate your troubles.
The carburetor being cleaned in this is off an old motorcycle and will look like most other carbs off a motorcycle or ATV. While most carburetors won’t look the exact same as the one being shown, they still will have most the same functions and layout.
- Phillips screwdriver
- Flat screwdriver
- Needle nose pliers
- Wire brush
- Wrenches or socket set
Remove the Carburetor
The first step in taking off the carburetor is turning the fuel valve off at the gasoline tank. Track the fuel line right all the way down to the carb and remove the hose. (If the line is old and cracked you may need to replace the hose to ensure there are no leaks.) There may also be an overflow hose coming out of the carburetor, remove this hose too. Next, loosen the screws in the clamps in the the front and rear of the carb. The carburetor must be loose; you must be able to wiggle and twist the carb to remove it. The carb will be held in by the throttle cable. The throttle comes off by twisting the top cap. When you unscrew it and it comes off the slide will still be attached to it. The carb should now be removed.
After doing away with the carb, you want to remove the throttle slide from the cable(still attached to the vehicle). This may be a difficult undertaking but the picture shows it completed to show the components. After you have the cable unhooked you can pull everything off the cable, and should have the parts in the picture.
Remove the Float
The float is that the bottom a part of carburetor and is that the very first thing taken apart when cleaning the carb. to get rid of the float bowl, unscrew the four screws on rock bottom of the carburetor. Remove these screws with care because they strip very easily. The float bowl then are often achieved the carb. If you’re not replacing the gasket make certain to not tear it. Cleaning the parts are going to be addressed later so don’t start cleaning yet.
Remove the float pin by pulling it out with a pair of needle nose pliers. After the pin is removed, the float are often removed. In some carburetors, the needle are going to be hanging on float and can begin with it. during this carburetor it’s not this manner so some steps are going to be out of order.
Remove the Jets
This step will differ from carb to carb, but the jets will got to be removed. during this carb there are some splash plates that needed to be began , not all carbs will have these. Jets are screws that have a hole through the middle of them which the fuel flows through to combine with air. The plates got to be removed to urge to the jets. the most jet is brief and fat; will have a hex head or a flat screwdriver head. The pilot jet is long and thin which can take a flat head screwdriver to get rid of.
On this carburetor the float needle is held in by a fuel splash plate. Remove this plate so the float needle can be taken out to be cleaned.
Remove Outer Parts
The last step before cleaning the carb is removing the last parts from the surface . The air screw and therefore the idle screw are often removed with a flat head screwdriver. they’re located on the edges of the carb. The idle screw is that the larger screw which adjusts the idle when the engine is idling.
Remove the air screw. The air screw is that the smaller screw which adjusts the air flow through the carb when the engine is running. If the choke are often faraway from the carburetor, remove it. Turn the highest with a wrench and therefore the choke like slide out.
BEFORE CLEANING CARB AND PARTS REMOVE ALL GASKETS AND O-RINGS. the simplest thanks to clean the carburetor and therefore the parts is to soak them during a gallon of carb and parts cleaner, however the can is pretty expensive for only one use. Follow the instructions on the can for cleaning. Parts also can be cleaned by spraying carb and choke cleaner.
Make certain so wear safety glasses, gloves are recommended, for cleaning. Parts should be scrubbed with a wire brush then sprayed with carb and choke cleaner. Spray the cleaner into the holes that the jets, air and idle screws, float needle, and choke came from. When cleaning the jets, make certain to spray cleaner into the holes. to form sure the jets are clean, look around them into light to form sure the opening is cleaned. If jets aren’t completely clean, blowing compressed gas through the opening will remove left over debris.
Confirm all debris is faraway from the carburetor. Dry the carburetor and every one parts, the simplest way is with compressed gas . Blow compressed gas into all holes, and detach all parts of the carb. After everything is dry, install the new o-rings and gaskets back to carb if you’ve got them, if not, reuse the old.
Install the parts in the opposite order in which they were removed. In this case, the float needle and the fuel splash plate were installed first. The jets and the splash plates were installed next.
Install Outer Parts and Float
Install the outer parts of the carburetor first. Start with the choke, then the air screw and idle screw. When installing the air screw(the skinny screw), screw it altogether the way then back the screw out a turn and a half. this is often the baseline, after the engine is running you’ll adjust it therefore the engine idles properly. The idle screw should be screwed in only enough to carry it. The baseline adjustment are going to be during a later step. Next install the float. to put in the float, line the holes up with the holes within the carburetor and slide the float pin in. The pin will slide around freely, just confirm it’s centered so it’s secure. to form sure the float needle is functioning properly, move the float up and right down to confirm the needle moves freely. If the needle gets stuck within the up position it needs replaced.
Install the float bowl onto the carb with the 4 screws on rock bottom . The carb should now be complete, without the throttle.
Install the Carburetor
Install the throttle slide back onto the throttle cable. Put the throttle cable through the highest cap of the carb and put the spring on. Put the needle within the slide and compress the spring and hook the top of the cable on to the slide. Before sliding the slide into the opening , confirm the squeeze the slide is lined up with the idle screw. once they are lined up, slide the throttle slide in and screw the highest cap on. to line the baseline for the idle screw, look down either hole of the carb and screw the idle screw in. When the slide starts to rise, screw the screw in half a turn.
Slide and wiggle and carb back to the rubber boots. Tighten the screws on the clamps to carry the carb into place. Install the gas line and overflow line to the carb.
The last step of the project are going to be to regulate your air and idle screw, to try to to this the engine must be running. If you would like to extend the idle, screw the idle screw in. Screw the air screw bent richen and in to lean out.