Note: The following paragraphs describe the procedures for the Keihin I carburetor. The procedures for the Keihin II carburetor are similar, but refer to Figures 3.5-3.9
1. On the carburetor removed from the engine, clean the outside.
2. Disconnect the accelerator pump rod, remove the spring clip, separate the rod and remove the nylon bushing with the spring (photo).
3. Remove the cotter pin and remove the washer with the rod (photo).
4. Loosen the screws. Remove gasket (photo).
5. Unscrew the screw from the base of the float chamber and remove the holder of the main jet (photo).
6. Carefully remove the main jets. Remove the O-ring if necessary (photo).
7. Unscrew and remove the corrective air jets and emulsion tubes (photo).
8. Unscrew the enrichment valve from the base of the float chamber.
9. Turn off an air jet of idling, then turn off a stopper and remove a fuel jet of idling.
10. Press out the float pivot pin and remove the float with needle valve. Disconnect the valve.
11. Carburetor disassembly is for cleaning purposes only. Clean all parts with fuel and if possible blow them out with compressed air. Do not clean jets and holes with wire. Check needle valve and float for wear. Replace if necessary.
12. Assembly is carried out in reverse order (photo). Before installing the upper part, check that the upper float setting matches the data in Specifications.
13. Guided by Fig. 3.10 or 3.11, clamp the cover at a 60°angle so that the needle valve is closed and the spring pin is not clamped.
14. Measure the distance between the top of the float and the cover (without gasket), using a steel ruler (photo). If adjustment is necessary, remove plug from cover and move needle valve as required.
15. Apply blocking fluid to the threads before installing the coating fixing screws (photo) and lubricate all connections with molybdenum grease.
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