So I stripped the top end down today and it is all fine. Bummer. Not sure where to go from here. I did find some metal shards in the oil filter so something has broken in the bottom. Any advice on diagnosing the problem anyone? It seems like the teeth on the camchain sprocket are slightly damaged on one side and as it was blowing out of the airbox when I cranked it wondering if it is possible the camchain slipped?

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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights