Figure 4-29. - Manual choke system.

Automatic chokes (fig. 4-32) have replaced the conventional manual choke. They control the air-fuel ratio for quick starting at low temperature and also provide for the proper amount of choking to enrich the air-fuel mixture for all conditions of engine operation

Figure 4-30. - Spring-loaded poppet valve in the choke valve.

Figure 4-31. - Off center choke valve.

Figure 4-32. - Automatic choke.