There is a rubber O-ring on the shaft of the distributor housing and it is very common for them to get hard, deteriorate, and leak. You'll need to buy the O-ring from Honda as it is not a standard size, then remove the distributor cap, note the position that the rotor is pointing, scribe a mark across the base plate of the distributor where it mates to the head so you can replace it, then remove the 3 bolts that hold the distributor in, pull it out and replace the O-ring.
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