Oil pump return spring

[Sepeteus]

Hello!
I have 70 BETOL (1990) Yamaha. I noticed that the spring that returns the oil injection pump lever back to the maximum position is faulty. I could not find that spring from Yamaha's parts list. So can you tell me which is the part number?
ps. Sorry for my bad english.

[boats.net]

That part is not sold separately, would have to replace oil pump.