- Stock #251838 - Rare Custom One Owner 1973 Bertram 31' Center Console with 2006 Twin Yanmar Diesel Engines with only 80 hours! Rare one owner custom 1973 Bertram Center Console Sport Fisherman with a Short Tuna Tower. This Bertram was repowered with 2006 Twin Yanmar 4 cylinder diesel motors, with approximately 80 hours since installed! Many people love the Bertram, you rarely see one with a center console and a cuddy cabin. This boat was a custom order, and now the owner must part with his long-time friend due to health reasons; he has loved and cared for this Bertram since new. Her fe... read more