Carburetor service and adjustment

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The detailed procedure for service a carburetor is always specified by the manufactures and varies in case of different types. However, the general procedure and the points of caution are given below.

          To remove the carburetor from the engine, first of all remove the air cleaner and disconnect the throttle and choke lineages. Next disconnect the vacuum advance unit and any other connections that may be there. After that loosen the flange nuts and remove the carburetor gently.

Dismantle the carburetor and clean each and every component in petrol. Detailed inspection of each part is then done and the faulty ones are replaced, after which the carburetor is reassembled and the flange bolts tightened. Remake the different connections in the order reverse to that done for removing.

Most important precaution is that the jets should never be cleaned with wires etc. rather they should first be cleaned with petrol and then with a blast of air. Secondly, you must work with clean hands, otherwise while assembling; the dirt from your hands will again go into the carburetor. Further, it must be remembered that any adjustments to the carburetor should only be done once it is first ascertained that the other components of the fuel system are working alright; otherwise the engine performance will not improve.

However the common adjustments and their procedure may be outlined as given below:

Idle adjustment

There is an idle adjustment screw provide in the carburetor. Screwing in the same decreases the idle port area and hence decreases the engine speed. The screw is adjusted till the engine runs smoothly at required speed. Generally this done by screwing-incompletely and then opening back by one or two turns. Another method for idle adjustment, which precise, involves attaching a vacuum gauge to the inlet manifold and adjusting the idle screw till maximum vacuum is obtained on the gauge.

Throttle adjustment

On releasing the accelerator pedal throttle valve should be completely closed, while on pressing pedal fully, it should be in full open position. This may be checked and if not found correct, the linkage may be adjusted, as provided for in the manufacture’s manual.

Other adjustments

Apart from the idle a throttle adjustments, the other adjustments which are provided in some carburetors are for accelerating pump, metering rod, floats etc. They may be performed as laid down in the manual.

Carburetor service and adjustment Carburetor service and adjustment Reviewed by knowledge people creators on May 31, 2019 Rating: 5
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