Cleaning And Inspecting

Clean carburetor body in solvent such as "Gunk" to remove varnish and carbon stains from fuel and air passages. Blow body dry with compressed air. Reverse air flow through each passage to ensure removal of all dirt particles. Never scrape carbon deposits from careburetor parts with knife or other steel instrument. Also, do not use wires or drills tc clean small holes. To do so may cause burrs or change hole sizes. This is particularly important to observe when cleaning jet openings.

Inspect all parts and replace any that are damaged or worn. The most important checks are as follows:

Check accelerating pump. Inspect diaphragm (31) for pinholes, cracks or deformation and replace if necessary. Inspect rod (7) for bending and boot (8) for cracks. Any dirt in accelerating pump passage should be blown out from side opposite nozzle or check valve will close, making cleaning impossible.

1. Screw & washer

2. Bracket

3. Screw

4. Screw

6. Screw

8. Boot

10. Screw, throttle stop

11. Spring

12. Screw, low speed mixture

13. Spring

14. Screw & washer

15. Bracket

16. Spring

17. Lever, throttle

18. Washer

19. Nut

20. O-Ring

21. Valve, fuel

22. Clip

23. Float assembly

24. Nozzle, main

27. Plug

28. O-Ring

29. Float bowl

31. Diaphragm

32. Spring

33. Housing

35. Screw & washer

36." Clip

37. Hose

38. Fitting

39. Spacer (not standard)

40. Plate, choke (not shown)

41. Lever, choke

42. Flange, mounting

43. Lever, accel. pump

44. Rocker arm

45. Spring, rocker arm

Figure 3-77. Keihin Carburetor - Exploded View

Check for dirt clogging overflow hose (37). If clogged, fuel may not flow out and instead flood engine, causing poor starting.

Check low speed mixture screw (12). Inspect for carbon lodging on tip and for damage to taper or screw, itself.

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