Small Engine Maintenance - Float Style Carburetor

Float style carburetors are common on small gas powered engines for outdoor equipment, including lawn and garden tractors. Many times when the engine is running rough or bad hunting (engine speed is not constant), it is because the carb needs a good cleaning and service.

Preparation

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Write to obtain the type of engine and then the serial number of the relevant carburetor kit, engine gaskets and filters. Prepare a clean working environment, an area of ​​smoke and NAKEDFLAME (gasoline vapors ignite very easily). Basic tools are required, the key (or taken to be permanent), pliers, can clean the carburetor to clean parts in a container and a container for storing parts. Together

Small Engine Maintenance - Float Style Carburetor

Carburetor Removal

Take a photo or a sketch with a pencil attached to the throttle connection, linkage and springs on the carburetor. This saves a lot of anxiety when you get back together. Turn off fuel to the carburetor, before the fuelLine to the carburetor. Some have a fuel shut-off, but the fuel hose clamp with a screw or drain into a clean container.

Remove the air cleaner, carburetor mounting nuts (screws) and the spring governor. Facilitate the carburetor from the engine is turned off, as one attempts to solve the Z-form connections with the throttle and choke valves. Note that there is still fuel in the pan at the base of the carburetor. Carburetor tip upside down to let the fuel drain valvein a container.

Disassembling the carburetor

Now you complete the carburetor into the air before trying to take it apart, the two screws (some have only one) search soft under the head of the bolt. This will be the screw-speed and high vacuum. Count the number of revolutions needed to go home and screw the needle, about a year and a half and the main jet and 1 time for the pilot project. Note that this will be the setting forbe used later.

Remove the high speed and idle adjustment screw, clean and ready for installation in a container. Remove the nut bowl, nut this little 'carbohydrate is where high-speed adjustment screw is located. To clean or replace the nut and washer, if necessary. Those high-speed needle is home to one or two small holes in the transfer of fuel. These get clogged - clean with a fine wire (made from a thin wire floral arrange an artisan). TheFloat next, pay attention to the aspiration needle of the fuel and as an attachment to the float hinge. Some of the brass float loose after a while 'float waving to me, when the fuel is sloshing over and replace, if so swimmers.

Use carburetor cleaner and spray out, then inside the carburetor, the air vents and needle. WATCH YOUR EYES - glasses to use. Make sure the throttle and flaps to move freely and that the gas and choke return springs close theValves.

If you are weak or broken, replace it by unscrewing and removing the pin the throttle, then reassemble with new springs. Inside the Venturi at the end of the throttle, there are 2 or 3 small holes (you need to move the valve in the open position, move them to see). I use a bow with one leg straightened and cleaned with a pliers from the ports. VIOLENCE IF YOU DO NOT BOW is larger in diameter than the diameter port.

Reassemble

InsertFuel float and needle. Place the bowl with the carburetor with a new O-rings. Screw the high speed needle and idle (not to mention the springs, 'O' ring and washer) until your seat, then back the screws to the speed you saw in the demo days. These settings should not start the engine, otherwise, replace two needles until it just fits. Unscrew the screw at least one shift and the high speeds of 1 and 1 / 2 laps. August EndThe adjustment takes place when the engine test run.

Connection with the design or take pictures, put the governor and choke, then with a new gasket to adjust the carburetor of the motor housing. Connect the regulator spring in the hole on the gas-Cam, usually the same hole as the link governor. Reconnect the fuel line and filter cover (with new gasket) to the body of the carburetor. Worn or dirty air filter

Adaptation

Start the engineand let it warm up to normal operating temperature (3-5 minutes). The maximum speed throttle position, then turn the mixture control at high speed (clockwise) slowly until the engine runs irregularly. Note that the position of the screw. Now back out the screw (clockwise) until the engine starts running again, unpredictably. Note that the position of the screw, then screw back in its central position, smoothly and at that point the engine.

Set the throttleto sleep or slow position and adjust the idle mixture in the same way as you use high speed mixing under control. Some time after setting the idle speed screw, you need to go back and adjust the setting at high speed.

Disclaimer - This article is intended as a guide only and is generic, and therefore can not accept responsibility for any injury or damage. There are many types of carburetors used in small engines, each with its own means of controlling the air / fuel mixture in the engine.But the above is typical of many small engine carburetor, which I maintained and repaired over the years I used an external power equipment sales and service ownership.

Small Engine Maintenance - Float Style Carburetor

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