Replace it every time because it's inexpensive.
Replace it with a new one every time to prevent oil leakage.
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1.4 USD (223 JPY)
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SR400 3HT1-9 FNo: 1JR
SR400 3HT1-9 FNo: 1JRH01J
SR400 3HT1-9 FNo: 1JRH03J
SR400 3HTA-W FNo: 1JR
[Type] OY-10
[Size] Inner diameter 6.8mm x wire diameter 2.5mm
[Stock part number] 93210-07135
[Location and purpose of use] Oil filter cover, mounting bolt
This is a repair O-ring and oil seal of the same size as the stock parts.
If oil is leaking or seeping from the oil filler cap, oil filter cap, spindles, or shaft, it is necessary to replace the oil filler cap with a new one.