Yenibertiz handed the Pilgrims an early lead at Boston Town's DWB Stadium, although the visitors levelled before the break.
There were no further goals to ensure United drew their first match of the season.
Boston (4-3-3): Harry Payne; Jack McCallum (George Hobbins 60), Kofi Ross (Jordan Tate 70), Daniel Moulds, Elliot Andrew; Jack Dykes, Harry Vince, Oli Drummond; James Gordon, Kemal Yenibertiz (Tinashe Chavundura 42), Tom Slade. Subs (not used): Sam Partridge, Travis Portas (gk).