NOTE

On models with the external adjustment, different floats have been used and these are not interchangeable.

Figure 28. Gauging Secondary Float

Figure 31. External Float Level Adjustment

Figure 32. Adjusting Fast Idle Speed

D. ADJUST FAST IDLE SPEED

(1) On 4160 with mechanical secondarys, adjust the fast idle speed on the bench. With the fast idle adjusting screw on the highest step of the fast idle cam, adjust the screw using a drill to obtain a clearance of .014 to .016 from the throttle plate to throttle bore.

Figure 30. Adjusting Float Tab

(2) All models with external fuel level adjustment maybe adjusted by inverting the pri mary or secondary fuel bowl, then loosen the lock screw enough to allow the adjusting nut to rotate. Turn the adjusting nut until the float lever or the base of the float is parallel with the floor of the bowl.

On other models, the fast idle cam screw should just touch the lowest step of the fast idle cam at curb idle with the choke plate wide open. This must be done before adjusting the idle adjust ing needles.