1986 Yamaha 90 hp 2 stroke ETLJ parts question

Blue Man

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Jan 22, 2015
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Hi I'm new to this forum, First posted yesterday. I'm getting some leaking from the top of the oil tank whenever I trim the motor up for transporting the boat. The oil is coming out of what appears to be some sort of pressure release valve at the top of the oil tank. I thought I'd just replace the four parts that assemble together on this pressure relief valve (if that is what it is) but it appears Yamaha doesn't make two of the four parts any more.

90386-03M59-00
6H1-24217-00-00

I've tried putting those part numbers into this website and they don't return any search results. I also tried several other parts websites and they don't carry these parts any more.

Does anyone know where I can get these parts or do you have any other alternative suggestions for fixing the problem? Maybe some kind of sealant such as Permatex around the edges?

Also, does anyone know the purpose of the part? (I was guessing)
 
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