Fitted y-piece yesterday, bike just serviced, oilsight glass full. Ran the engine for a couple of minutes to check zorst system for leaks. Checked this morning, oil level halfway down glass. Where did it all go!!??
Forgot to say I'd been out on a run for about 50 miles after the service so the oil filter thingy's a nonstarter. Will give it a run and see if it re-appears as if by magic.