The 4V423188L0 O-ring can be ordered. View linked machines. 4V4-23188-L0-00 is the manufacturercode.
The O-ring appears in these Yz490 Competition 1985 (f) Usa parts lists:
AIR VALVE COMP. | 23X23190L0
O-RING | 3J22314700
BOLT, CAP | 43M23111L0
| 56A2316AL0
PLUG, DRAIN | 4H72311900
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