Career
He races a Yamaha YZF-R1 in the MFJ All Japan JSB1000 Championship. A former competitor in the MFJ All Japan Road Race GP250 Championship between 1999 and 2005, Nakasuga moved into the All Japan Superbike Championship, winning the title in 2008, 2009, 2012, 2013, 2014 and 2015 for Yamaha. Nakasuga made his Grand Prix debut in the premier class at the Valencia circuit at the final race of the 2011 season as a replacement for the injured Jorge Lorenzo, finishing a creditable sixth place.
In 2012, he made a wild-card appearance for Yamaha at his home race at Motegi, finishing ninth, before making another appearance for the factory team at Valencia, this time in place of the injured Ben Spies.
Alongside his racing duties, he currently is the lead test rider for Yamaha in MotoGP.