an elastic intake adapter, wherein a portion of the intake channel is guided in said intake adapter, wherein said intake adapter is provided with a partition that extends over at least a part of a length of said intake adapter, in the intake adapter, to divide said intake adapter, and hence said intake channel, into a mixture channel, and into a supply channel for supply of largely fuel-free air, wherein a flow cross-section of an inlet opening into said mixture channel is greater than a flow cross-section of an inlet opening into said supply channel, and wherein said partition is curved toward said supply channel.