I recently joined the forum and was excited to see an exclusive Yamaha thread.
This was the first bass I ever owned, a Yamaha BBG4 in "Amber Burst" purchased from Guitar Center in 1998. I've made considerable modifications to it over the years: Added Bartolini Jazz pickups, Bartolini 2-Band preamp, Hipshot A Style bridge, graphite nut, Carvin tuners, string ferrules, Battery Box, black hardware.
At one point it was in need of a refret so I decided to try a little something different. I was playing a Specter NS2000-5 pretty much exclusively at the time and wanted a fretless bass. I decided to have a Maple fretless fingerboard made and installed on my original neck. I eventually ordered a replacement neck from Yamaha and put my fretless neck on another body I bought off Ebay which is shown below.
This one was once a BBN4 purchased from Ebay, I replaced most all off the stock parts just as on my other bass: Hipshot A Style Bridge, string ferrules, battery box, Carvin Tuners, Barotlini 3-band Preamp, Carvin Stacked humbuckers, black hardware. I use Thomastik Flatwounds on this bass, and it has a nice warm tone surprisingly, considering the Maple board.