Best I can do you is 1994 levels, from an RS250 Showa overhaul manual:
Standard Oil Level - 130mm
Standard Oil Capacity - 373cc
Recommended fork fluid - Honda Ultra Cushion Oil (SAE 5W)
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Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
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