The 1UY1211401 Spring, Valve Outer can be ordered. View linked machines. 1UY-12114-01-00 is the manufacturercode.
The Spring, Valve Outer appears in these Yfm350xt 1987 Warrior parts lists:
SEAL, VALVE STEM OIL | 1J71211901
SPRING, VALVE INNER | 1UY1211301
SEAT, VALVE SPRING | 3Y11211600
RETAINER, VALVE SPRING | 3Y11211701
VALVE, EXHAUST | 1UY1212101
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