The first gear clunk is normal.. but the others.. might be a badly adjusted clutch( too loose not enough pull or oil issue. I run 15w40 Rotella conventional . smooths out the shifts but not quite perfect ..it's ayamaha thing i think.
YamahaStarStryker.com is an independent Yamaha enthusiast website. Content on YamahaStarStryker.com is generated by its users and YamahaStarStryker.com is not in any way affiliated with Yamaha Motor Corporation, U.S.A.