The only other thing would be dirt, grit or corrosion behind the shaft seal. You have already eliminated most anything else other than a slightly bent shaft. It sounds to me that you pretty well know your way around an engine.
I would go ahead and pop the old seal out (get a new one in hand first), then see what you can see. If you pull the shaft and a slight bend is present, find the highpoint and give it a slight bend back. If you feel the need, then get a new one from the dealer or Google " motorcycle salvage honda " and get a good used one for less cash.
Please rate this solution. Thanks p_maj57!
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Hi thanks for the advice will try it at the weekend, will let you know how i get on. Cheers Paul
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