For adjusting valve clearance on twin-cam models Holds valve spring bucket down so adjusting shims can be removed Manufactured from hardened alloy steel Same design as the OEM tool Replaces Suzuki tool 09916-64510 and Yamaha tool YM-04125 Fits all Suzuki 4-stroke models with shim-type valve tappets Fits all Yamaha XJ600 Seca II models Fits: Suzuki GS550 1977-1980 GS750 1977-1979 GS850G 1979-1980 1982-1983 Yamaha XJ600S SECA II 1992-1996