Yamaha XTReme Terrain Challenge Announcements: Yamalube Sponsors Entries and Josh Gracin Headlines Post-Ride Concert MARIETTA, Ga., Oct. 22, 2018 (GLOBE NEWSWIRE) -- Yamaha Motor Corp., USA, announces news on the upcoming Yamaha XTReme Terrain Challenge, an all-new off-roading adventure for Yamaha YXZ1000R and...