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ARMY  TM  9-2805-262-14 AIR  FORCE  TO  38G2-90-1 NAVY NAVFAC P-8-613-14E 4-25. Carburetor. This task covers: a. Adjustment c. Inspection b. Removal d.  Installation INITIAL   SETUP Tools Equipment Condition General Mechanic’s Tool Kit (Item 1, Appendix B) Air intake elbow removed for removal or carburetor Test Set, Tachometer and Dwell (para.  4-24). (NSN 4910-00-788-8549) (Item 2, Appendix B) Materials/Parts Rags, Wiping (Item 7, Appendix D) Solvent, Drycleaning (Item 8, Appendix D) Gasket,  Carburetor  Mounting  (P/N  9786E26-2) a. Adjustment.  (figure  4-17) Turn main adjustment needle (1) and idle adjustment screw (2) fully clockwise. turn main adjustment needle (1) 3/4 of a turn counterclockwise. Turn idle adjustment needle (2) 1/2 turn counterclockwise. Start engine (para. 2-9), and allow engine to warm-up. Apply a load, and adjust main adjustment needle(1) until a smooth idle is achieved. Set  idle  speed  adjustment  (3)  to  idle  position. Adjust idle speed of engine by adjusting idle speed screw(2) until an idle speed of 200-900 r.p.m. is obtained. Stop  engine  (para.  2-10). 4-38 Change 1


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