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Aisan Carburetor Tuning Pdf Download

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MessagePosté le: Ven 28 Oct - 16:52 (2016)    Sujet du message: Aisan Carburetor Tuning Pdf Download Répondre en citant

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Aisan Carburetor Tuning Pdf Download

Application Number: 06/033665 . (Aichi, JP) . 4. The idle adjusting screw device as set forth in claim 1, wherein said rod portion has a largest diameter adjacent said step surface and tapers continuously therefrom in a direction toward said free end thereof, said coil compression spring huggingly engages said rod portion throughout the entire length of said spring and of said rod portion tapering in a direction toward said idle port. Title: Idle adjusting screw in carburetor . Therefore, it is desirable to design the mixture adjusting screw such that it can not be randomly adjusted by the user once it has been properly adjusted by the maker. Thus, according to this invention, the screw adjustment can be as easily accomplished by the maker as with the conventional screw, and after the adjustment, the screw is securely held in position by a spring to maintain its proper adjustment. The idle adjusting screw device as set forth in claim 4, wherein said threaded portion is extendable simultaneously into said cavity and said insertion hole. A plug 7 is driven into the peripheral edge of the cavity 8" and secured in position so as to cover the screw head.

Claims: What is claimed is: 1. SUMMARY OF THE INVENTION The present invention is to provide a mixture adjusting screw which is so constructed that it can not be adjusted by the user but which has no greater difficulty for adjustment for the maker as compared with the conventional screw. Foreign References: CA968332A1975-05-27251/DIG.4DE2378574July, 1923261/41DDE2522322April, 1931261/41DDE1924733A11970-01-15261/41DFR613440A1926-11-17261/41DDE378574C1923-07-19DE522322C1931-04-07 . 3A and 3B show shapes of the screw head. Inventors: Arai, Hisaharu (Nagoya, JP) . Namely, in an idle adjusting screw device for carburetors, having a mixture adjusting screw fitted into a carburetor body such that a needle portion at the forward end section of the screw is disposed in an idle port of the carburetor body, an improvement which comprises a screw (1) consisting of a head portion (6), a threaded portion (2), a rod portion (1'), and a needle portion (4); a carburetor body (8) having a cavity (8"), an insertion hole (8") with which a fuel passage (9) is communicated at an acute angle, and an idle port (5), all of which are formed integrally such that the axis common thereto is inclined, the screw (1) being fitted into the carburetor body such that the needle portion (4), rod portion (1'), and the head portion (6) are positioned in the idle port (5), insertion hole (8'), and cavity (8"), respectively; a coil spring (3) which is provided around the rod portion (1') so as to urge the screw (1) counter to the screw inserting direction and which is exposed to the fuel passage; and a detachable plug fitted into an outer end portion of the carity (8") so as to cover the head portion (6), which head portion of the screw is specially shaped so that the screw (1) cannot be turned with an ordinary tool, the plug and the specially-shaped head portion (6) constituting double means for preventing random operation of the screw. The plug 7 is firmly fixed so that it cannot be removed without using a specific tool. 1, it will be seen that a spring 3 is coiled around the rod portion 1' below the threaded portion 2 of the screw 1, with one end of said spring 3 being pressed against the lower end face of the threaded portion 2 while the other end being secured against the lower end of the rod portion insertion hole 8' so that the spring is held in a compressed state. The idle adjusting screw device as set forth in claim 5, wherein said carburetor body defines a horizontal throw port communicating with said insertion hole, a throw port plug is inserted in said throw port and defines an inclined surface constituting a portion of said insertion hole, said throw port plug defining a vertical channel communicating with said insertion hole and vertically aligned with said fuel passage thereabove, said vertical channel constituting an extended portion of said fuel passage. BACKGROUND OF THE INVENTION The conventional mixture adjusting screw was so designed that it can be freely adjusted by the user even after the carburetor has been mounted in position in the engine, so that there was a risk that the screw would be improperly readjusted by the user to cause a change in the fuel efflux during idling and a corresponding change in the exhaust gas emission even beyond the level regulated by the law.

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