What is the speaker implying about his feeling in lines 23-24?

James Whitcomb Riley's poem "When the Frost is on the Punkin" expresses the speaker's love of autumn. He describes the features of the season as well as his joy at welcoming it each year.
Lines 23 and 24 close out the third of four stanzas. The speaker exclaims,

O, it sets my hart a-clickin’ like the tickin’ of a clock,
When the frost is on the punkin and the fodder’s in the shock!

Line 23 describes the speaker's feelings: his heart is beating quickly with excitement. This implies that he feels a sense of joy when the autumn season begins. The reference to the clock could also indicates that he feels this way each year when fall begins. His enthusiasm is reliable and regular at this time of year. Line 24 repeats the same line that closes each stanza of the poem, which could again support the point that the speaker feels the same way each fall.
Other lines of the poem support the speaker's excitement, as well. In the first stanza he describes fall as a time "a feller is a-feelin’ at his best" (5). The second stanza describes the pleasant weather and the beautiful scenery. The speaker says, "Is a pictur’ that no painter has the colorin’ to mock" (15), meaning an artist cannot recreate the beauty of the season. Further, the use of exclamation points at the end of each stanza after the repeated line evoke the speaker's joy and enthusiasm for autumn.