View of the carburetor from the throttle actuator side
1 - air damper; 2 - starting device; 3 – air damper drive lever; 4 - telescopic rod; 5 – damper control lever; 6 - a lever that limits the opening of the throttle valve of the secondary chamber; 7 - return spring; 8 - rod connecting the throttle valve of the primary chamber with the drive of the starting device; 9 – pneumatic actuator rod; 10 - pneumatic actuator
Carburetor throttle body parts
1 – damper control lever; 2 - a lever that limits the opening of the throttle valve of the secondary chamber; 3 - bushing; 4 - lever connection with the air damper; 5 - a lever fixed on the axis of the throttle valve of the secondary chamber; 6 - spring; 7 - lever connected to the pneumatic actuator; 8 - throttle body; 9 - return spring of the primary throttle valve; 10 - axis of the secondary throttle; 11 - throttle valves; 12 - the axis of the primary throttle; 13 - restrictive sleeve; 14 - screw for adjusting the composition of the idle mixture; 15 - sealing ring; 16 - screw for adjusting the amount of the mixture; 17 - bushing of the screw of the amount of the mixture; 18 - mixing sleeve; 19 - spool; 20 - spool spring; 21 - throttle axis lever of the primary chamber
Details of the carburetor body
1 – a rod of a pneumatic drive of a secondary butterfly valve; 2 – pneumatic actuator housing; 3 - diaphragm; 4 – pneumatic drive cover; 5 - fuel jet of the transition system of the secondary chamber; 6 - housing of the fuel jet of the transition system; 7 - small diffuser; 8 - accelerator pump atomizer; 9 - screw valve of the accelerator pump; 10 - the main air jet of the secondary chamber; 11 - emulsion tube of the secondary chamber; 12 - the main air jet of the primary chamber; 13 - emulsion tube of the primary chamber; 14 - the main fuel jet of the secondary chamber; 15 - the main fuel jet of the primary chamber; 16 - adjusting screw of the accelerator pump; 17 - idle fuel jet; 18 - housing of the idle fuel jet; 19 - return spring; 20 - accelerator pump diaphragm; 21 - accelerator pump cover; 22 - small diffuser of the primary chamber; 23 - return spring of the air damper drive lever; 24 - air damper drive lever; 25 - thrust connection with the throttle; 26 - throttle return spring bracket
1. Remove return spring 7 (see fig. View of the carburetor from the throttle actuator side) a lever that limits the opening of the throttle valve of the secondary chamber. Unpin and disconnect from the throttle lever rod 8.
2. Disconnect the rod 9 of the pneumatic actuator from the throttle actuator lever of the secondary chamber.
3. After compressing the spring of the telescopic rod 4, disconnect it from the three-arm lever 3 of the air damper drive.
4. Unscrew the screws and disconnect the cover with the gasket from the carburetor body, being careful not to damage it and the float.
5. Having unscrewed the fastening screws, disconnect the throttle body from the carburetor body, being careful not to damage the adapter bushings of the carburetor fuel-air channels and bushing sockets pressed into the body. Carefully remove the thermal insulation pad.
Carburettor cover
6. Using a mandrel, carefully push out the axle 16 (see fig. Carburetor cover details) float 17 of the racks (push to the side of the rack with a cut) and remove the axle with smooth nose pliers. Taking care not to damage the float tongues, remove it with the needle valve 15.
7. Remove the cover gasket 11, unscrew the needle valve seat 14, unscrew the plug 13 and remove the fuel filter 12.
8. Disconnect the telescopic rod 7 and the rod 19 of the starter drive from the lever of the axis 8 of the air damper.
9. Unscrew the two screws securing the case 6 of the starting device and remove it.
10. Unscrew the three screws securing the cover 2 of the starting device and remove the cover with the adjusting screw 1 and the spring 3.
11. Remove diaphragm 4.
Throttle body
12. Remove screw 14 (see fig. Carburetor throttle body parts) idle adjustment.
13. Unscrew the screws securing the sleeve 17 of the idle mixture amount screw and remove it together with the screw 16.
14. Bend the tab of the lock washer and unscrew the nut securing the levers on the axis of the damper of the primary chamber.
15. Remove the lock washer, levers 1, 2, 4 and 21 with washers and bushing 3 from the axis of the damper of the primary chamber, and then the compression spring 20 of the spool and the spool 19.
16. Unscrew the nut securing the levers on the axis of the throttle valve of the secondary chamber, remove the levers 5, 7 with washers and spring 6.
Carburetor body
17. Turn out the screw of fastening of the lever 24 (see fig. Details of the carburetor body) air damper actuator, remove the lever and spring 23, disconnect the rod 25 from the lever.
18. Unscrew the screws securing the cover 21 of the accelerator pump, remove the cover with the lever and the diaphragm 20 of the accelerator pump with the return spring 19.
19. Unscrew the main air jets 10 and 12, turn the body over and, tapping it lightly, shake out the emulsion tubes 11 and 13 from the wells.
20. Unscrew housings 6 and 18 of the jets and remove them together with jets 5 and 17.
21. Unscrew the screw valve 9 and remove the accelerator pump atomizer 8 with gaskets, unscrew the adjusting screw 16.
22. Take out small diffusers 7 and 22.
23. Turn out the main fuel jets 14 and 15.
24. Turn out screws of fastening of an arm 2 and remove a pneumodrive of a butterfly valve of a secondary chamber.
25. Unscrew the three screws securing the cover 4 of the pneumatic drive and remove it, and then the spring and diaphragm 3 with the stem 1.