2000 Yamaha YZF-R1 Engine Rebuild - Part 15

Part 15 - Lapping in the new valves. Wow, this was a lot of work. My advice - get your valve seats cut by a CNC machine, much easier than hand lapping. Previous Video: http://www.youtube.com/watch?v=o4bXlLfu6n8 Next Video: http://www.youtube.com/watch?v=H_CRbU7t_eQ