Every 20 minutes there is a boat from Yeniköy to the Beykoz Pier. Kundura is in fifteen-minute walking distance from the pier. If you wish you can also go to the Kundura Factory bus stop via minibus or regular bus, and then reach Kundura by a short walk. Furthermore, you can easily find taxis to Kundura from the taxi stop near Beykoz Pier.
Via sea-bus you can reach Beykoz from the city center in week days at certain hours.
You may also use sea-taxi, since Beykoz Kundura has a private pier.
You can reach the Kundura Factory stop by shared taxis coming regularly from Kadıköy or Üsküdar, and then reach Beykoz Kundura on foot.