Update
I couldn't get a fork seal that was 41 x 53 x 10.5. So, the seal shop ground down a 41 x 54 x 11 seal, but this leaked badly when fitted.
I then noticed that the one that had been removed had 41 x 54 x 11 stamped on it. (Not sure if this is an original Yamaha part, or something a previous owner had fitted.)
So we fitted an unmodifed seal (41 x 54 x 11) and this seems to be holding the oil (so far, fingers crossed!)
Cheers
Mark
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