On this parts fiche the Lock, Valve Spring (447) is the most specified component.
The most reasonably priced component used on the Xt500 1981 Dual Purpose Usa Valve is the Lock, Valve Spring (447).
The Yamaha VALVE has twelve products enlisted in the schematic.

SEAT,VALVE SPRING

RETAINER, VALVE SPRING

VALVE, INTAKE

VALVE, INTAKE (NON O.E. ALTERNATIVE)

VALVE GRINDING PASTE, 80-180

VALVE GRIDING PASTE. 150-320

LOCK, VALVE SPRING (447)

SEAL, VALVE STEM OIL

VALVE, EXHAUST

VALVE, EXHAUST (NON O.E. ALTERNATIVE)

ARM, VALVE ROCKER

SHAFT, ROCKER 2

SHAFT, ROCKER

SCREW, VALVE ADJUSTING

NUT, HEXAGON

SPRING, COMPRESSION (1T1)

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XT500 1981 DUAL PURPOSE USA

It is fair to say this machine started a rich XT heritage for reliable four stroke enduro machines. It was light and blessed with enough performance to bring a smile to anyone’s face who rode or owned one. It was handsome and capable, both off road and on road, where it handled a lot better than many purpose built tarmac machines, and it’s mid range punch could embarrass many a 400cc sports road bike of that period. 
It did have problems that are now easily remedied, namely the ignition not supplying a strong enough spark, making hot starting a hit or miss affair.
Highly coveted by collectors, machines in top condition change hands for surprisingly large amounts, making restoration economical sense.


YAMAHA XT500 1981 DUAL PURPOSE USAVALVE

VALVE, INTAKE

VALVE, INTAKE (NON O.E. ALTERNATIVE)

VALVE GRINDING PASTE, 80-180

VALVE GRIDING PASTE. 150-320

VALVE, EXHAUST

VALVE, EXHAUST (NON O.E. ALTERNATIVE)

SPRING, COMPRESSION (1T1)

SPRING, COMPRESSION (1T1)

SEAT,VALVE SPRING

SEAL, VALVE STEM OIL

RETAINER, VALVE SPRING

LOCK, VALVE SPRING (447)

ARM, VALVE ROCKER

SHAFT, ROCKER

SCREW, VALVE ADJUSTING

NUT, HEXAGON