They are used on both 2 and 4-cycle vertical and horizontal shaft engines in the 2 through 7 h. It is a float style carburetor with a smaller venturi than the Series 3 and 4 carburetors. Some will have an adjustable idle and main and others will have a fixed main with an adjustable idle. There are also some fixed speed applications that will only have a fixed main system and the idle system will not be drilled.
This carburetor is similar to the standard Series 1 carburetor. The emission equivalent has a fixed idle and main. The idle restrictor jet will be capped to prevent access unless the cap is removed. The fixed main jet is part of the bowl nut.
Aball plug is visible from the bottom, which seals the passage. This carburetor also has a serviceable main nozzle emulsion tube. Series 2 carburetors were used on outboard engines. This carburetor is the same as the Series 1 with the exception of the remote adjustable idle mixture screw, and a built in fuel pump. Series 2 carburetors have a built-in fuel pump consisting of a fuel pump element which inflates and deflates with crankcase pulsations which opens and closes two flap valves in the fuel pump, thereby pumping fuel from a remote tank to the carburetor float bowl.
When replacing the fuel pump element, install with the slot opening at a 45 o angle as illustrated. Installation in any other position will damage the diaphragm.
Series 3 and 4 carburetors are generally used on 8 through The venturi size of these carburetors are larger than Series 1 and Dual System Carburetors. The quickest way to identify these carburetors is by the presence of bosses on each side of the idle mixture screw.
To determine whether the carburetor is a Series 3 or Series 4, look at the throttle or choke end of the carburetor. The Vector carburetor is a float feed, nonadjustable carburetor, with a one piece extruded aluminum body. The float bowl, float, nozzle, and venturi are nonmetallic, which eliminates the corrosion and varnishing problems associated with similar metallic parts.
Common service areas of the carburetor are contained in the fuel bowl, which include the float, needle, seat and main nozzle emulsion tube. All of these parts can be serviced without removing the carburetor body from the engine. If the unit was run with poor filter maintenance the venturi should be removed and the air bleeds cleaned with solvent.
Series 6 carburetors are used on 2 and 4-cycle engines. They have a larger venturi than the dual system carburetor and use a simple fixed idle system. Series 6 carburetors used on both vertical and horizontal applications are nonadjustable.
The 4-cycle version pictured has a stepped primer bulb. The bowl nut is left-hand thread. This bowl nut is identified by an "L" stamped on the nut and the international left thread notches across the points.
A dampening spring is installed on the float hinge pin to reduce erratic float travel. The two mounting bosses extend out from the carburetor body. The Series 7 carburetor is an emissions grade carburetor used on medium frame vertical shaft overhead valve engines. It has a non-metallic bowl and a snap-on bowl retainer to connect it to the carburetor body. This model has a fixed main jet and a fixed idle jet; both are located in the carburetor bowl. The float bowl, float, nozzle, and venturi are non-metallic, which eliminates the corrosion and varnishing problems associated with similar metallic parts.
The Series 8 carburetor has both a fixed main and idle circuit. The fixed idle system is achieved by a restrictor jet that meters the fuel for the idle circuit.
A ball plug is visible from the bottom, which seals the passage. It also has a stepped primer bulb. Table of Contents Introduction. Use only genuine TecumsehPower service parts.
It should be on the side of the barrel of your carburetor. Turn the adjustment screw clockwise until the needle valve is closed and seated at the bottom. Make sure you do not overtighten or you will damage the valve.
Turn the adjustment screw counterclockwise until the engine is about to stall out from too much fuel. Turn the adjustment screw back clockwise to the midpoint between too little fuel and too much fuel.
Carl Pruit has been a freelance writer since , specializing in service journalism and travel. The dimple serves the purpose of minimizing the chances of the float that may at times stick to the bottom of the bowl that is mainy caused by stale fuel. For float removal purpose, using a needle nose pliers carefully grasp the cross piece lying somewhere between the center leg as well as the pivotal point on the float.
It is very important to pull out the float straight out in such a manner that it does not break. While installing the float, into the hinge slot present on the float place the float hinge pin and slowly press into place in the bowl. In order to hold the seat in the place, there may be few types of bowls that may also contain a clip or retaining ring. This feature may come pre-installed as needed for the manufacturing process. In order to make the process of assembly easy, on the gasket and the bowl an alignment notch is also placed that would guarantee a proper location for the gasket.
All the welch plugs must be removed in order to expose the drilled passages to facilitate proper cleaning. Sharpen to wedge point a small chisel in order to remove the welch plug. Carefully drive chisel inside the welch plug and then push down on chisel to out of the position. As illustrated, a new welch plug must be installed bell-up. Tap down on to the plug using a punch that is equal or greater than actual size of the plug.
Make sure that the dent must not drive to the center of the plug below or to the top surface of the carburetor. Since the nail polish offers resistance towards the fuel, nail polish can be used to seal the outside edge of the plug with nail polish after installation of the welch plug, in order to ensure that no air would enter the mixing well, as a result leakage of the fuel can be avoided.
For the purpose of identification, you can use different colors so that the work of the previous repair person can easily be identified. Make sure that you install it in the same position as that of the original one.
As an integral part of the fitting strainer might be a part of some diaphragm carburetors. Replace the fittings if the strainer is not possible to be cleaned or lacquered.
Carefully insert the tip inside the carburetor body while installing a fitting. Using a Loctite grade A coat the exposed portion of the shank and press it in until the shoulders come in contact with the carburetor body.
To successfully remove plastic part of inlet fitting, a plier or vise can efficiently be used. First of all on the air horn of the carburetor, place the choke plate. It is very important that the flat surface must face downwards.
Each carburetor as designed to operate, can operate only in one way, however the choke plates can operate in both directions also. Make sure these choke plates are assembled properly to operate in right direction for your engine. NOTE: While reinstallation of choke or a throttle shutter, always use a new screw s. Old screw s must never be reused. NOTE: One thing that needs to be taken care of is that the binding must not occur.
In case if there is no designation mentioned, then the general sequence of installation is the gasket, diaphragm and cover in the end. There rings on the emulsion need to be removed while servicing these carburetors. The tube bends a 90o hook in a paper clip or stiff wire to remove. Reach inside the venturi and try to push out the main nozzle emulsion tube as far as possible.
Try to Hook the wire inside the air bleeding hole and carefully pull out to remove. To put tension on the tube in order to force it towards the gasket, an emulsion tube spring in the Vector as well as Series 7 carburetor can successfully be used. This can be efficiently used to seal the tubes thereby to prevent inflow of any unmetered air into the center leg. The proper series can be firstly float bowl then the spring, the tube, gasket and towards end is the carburetor body.
The emulson tube can be removed by gently grabbing the tube with a needle nose plier and pulling it out straight. Replace the tube in case if it is distorted or damaged. Occasionally, on the dual system carburetor equipped engines, some rich starting conditions may have occurred at times when the engine is warm.
Using the white plastic spacer this can efficiently be corrected as shown and at the same time inserted in to the center leg of the carburetor. Service To reduce considerably the amount of prime charge into main nozzle area this spacer has been designed for a better starting under the warm engine conditions.
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