4. As the slide is opened, the mixture also enters the engine through the second pilot fuel hole inside the slide.

5. The mixture     is controlled by changing the pilot fuel jet to a larger or smaller size for richer or leaner mixture.

6. The mixture can be adjusted by turning the low speed air screw clockwise for richer and counterclockwise for leaner.

7. This carburetor is used on trials motorcycles, so correct adjustment of the pilot metering system is critical.
 

1. This system operates from 1/8 to 1/4 throttle opening (see Figure 12, page 78).

2. The slide cutaway directs air down over the needle jet, reducing the vacuum and fuel flow.  As the needle is raised, it meters the fuel flow.

3. A higher cutaway causes a leaner mixture and a lower cutaway a richer mixture.

4. The mixture can be controlled by changing the needle jet, but it is better to change the slide cutaway on this model.

Slide, Needle Position and Booster System

1. This system operates from 1/4 to 3/4 throttle opening (see Figure 13, page 79).

2. As the slide is raised, the cutaway has less effect on air flow over the needle jet.

3. The needle meters the fuel flow as it is withdrawn from the jet.

4. The mixture can be adjusted by raising or lowering the needle to enrich or lean the mixture. 5. At 1/2 throttle opening, air enters the booster hole (see Figure 14) into the needle jet through small holes halfway up it, increasing the fuel flow.  This system is not adjustable.