Thanks.
I started removing the valve covers, obviously there are 4 of them and you can probably guess how many I had to remove to find the missing spring?
Yes, thanks to Murphy/Sod, all 4 needed to come off. Turns out it's the vertical cylinder intake that's missing a spring.
No other apparent damage, the seal is still in place and, actually it's probably the easiest to get at as I can do it standing up over the bike but it was the worst to gain access to as I had to remove the tank, battery and battery box to get there.
I suppose it wouldn't do it any harm to leave it as is, no worse than the OEM seals? and that valve isn't sitting in a pool of oil like the horizontal exhaust does plus, I've no idea when it fell off but I'd rather it be right.
Here's hoping slipping a new spring over it is easy enough.
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M900, 916, LeMans II.
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