520 Motorcycle Front Sprocket For Yamaha YZF600R Thunder 1996-2007 SV400 KLE400 KLE500 Engine Parts YZF600R Thunder 1996-2003 2005-2007 SV400 KLE400 KLE500 drive shaft spline 520 chain pitch direct bolt on installation without grinding or for fast transmission machined tooth profile enables smooth chain meshing to lower friction noise power loss treated hardness wear rust deformation under long distance riding strict dimensional tolerance ensures firm mounting prevents looseness premature chain abrasion