Figure 72. Throttle valve positions: a - partial opening of the throttle valve of the first chamber; 6 - full opening of throttle valves; 1 - second chamber throttle lever; 2 — first chamber throttle lever; 3 - first chamber throttle valve; 4 — second chamber throttle actuator lever; 5 — screw for factory adjustment of the completeness of closing of the throttle valve of the second chamber; 6 — second chamber throttle valve.
Full opening of the throttle valves is checked by turning their drive levers to the stop position. The maximum opening of the first chamber throttle valve (13±0.1) mm is achieved by adjusting the carburetor control drive. The maximum opening of the second chamber throttle valve should be (17±0.1) mm and is ensured by the design of the valve drive.