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Depending on the climate that you live in. Cold temps SAE10W30SE to hotter climates SAE10W40SE.
Hotter climates still and if you can find it 20W40 and 20W50
Off hand, don't know the size of the crush washer. I assume this is for the oil pan drain plug. They are of a very common size and freely available at just about any motorcycle parts store. They are an aluminium washer, not a copper crush one. I've actually never replaced one ever and have never had a leak. If they are a little deformed you can sand them lightly to even them out.
I cant mail it to you, but i can give you the link so you can download it yourself Service manual for 1998-1999 Yamaha YZF-R1 (11.7 MB) In PDF Download | Mirror right click >> save as
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