Thank you for the advice. I've already pulled the engine out so, given the bike's history (it was running on half a litre of oil when I got it), I'm going to try to check everything I can without going so far as splitting the crankcase. Once I've finished making a tool to replicate the very expensive Yamaha fly wheel holding tool I'll try to get the cam chain out and do the stretch test. I know it's a tough one to get out but if I don't try I'll never be able to ride with the peace of mind that will hopefully come from knowing I've checked it all.
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