It may sound like a trivial question but I'm doing a nut and bolt restoration of my 1975 XS650B which is nearly back on the road. Went to the motorfactors today to buy 10/30 fork oil but was told it was unavailable. Can anybody recommend what weight fork oil I should use. The Haynes manual says 10/30 as does the original Yamaha supplementary service manual. Any advice would be greatly appreciated. I'll post a photo when the bike is finished. Can't wait!!!