OIL always change it even if you thought you had, do it again , and at least every 750 miles and or once a year, use single grade oil,50 grade summer 40 grade winter unless its very cold where you are its 30, but who rides classic bikes at minus ten, ? never multigrade or synthetic, nuff said, Andrew.h.

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I always use Castrol GP50 in my Norton. Use it in engine, gearbox and chaincase.