Premium Grade CT90, C90, CS90, ATC90, ATC100, S90, CM91, CL90   Exhaust Valve 

TJRK   Made in Japan

Replacement for OEM:  14721-028-000 Superseded by 14721-028-600

HARD DIA: 23.0mm

LENGTH: 66.6mm

STEM DIA: 5.5mm

Please carefully check your parts manual to make sure these are the Exhaust Valves you are looking for and are compatible with your bike