There will be oil everywhere in there, IMO you can't really tell which pucks are leaking except if there is oil around the spark plug. To clean most of the oil out of the crevices I use soft foam pieces about a square inch and long nose pliers to soak up the oil, maybe 2 to 4 pieces, the foam does an excellent job. Be sure to use some sealer on the pucks. Permatex make a gasket II seems to work well. If you have any stripped threads it can effect how long you stay leak free in the future, if using heli coils use some red loctite when installing them, they will be much better that way but I like to leave them over night to set before bolting things up, otherwise you will get the red stuff on the bolts as well, not good for future removals, once the heli coils are in you can mop up any loctite with dry cotton buds as well. I have had helicoils pull the threads from the head, this is why i use the loctite, it's a bigger drama if the helicoil pulls the alum threads.
Also oil will have filled a lot of bolt holes, mop it out with cotton buds before you reinstall the bolts, I also like to do a final clean with thinners on a cotton bud and then use thread seal on the bolts that hold the towers down, hopefully you won't have any stripped threads, on mine just about all of them were stripped. The bolt threads can use a good clean with thinners as well, the cleaner everything is the better the sealer works obviously.
This job needs to be done right or your leak free Honda will leak again, as I said in an above post, I got 5,000 Kays from my previous pucks but when I opened the top up I found a couple of helicoils had pulled the threads and this meant less pressure of the pucks so one started leaking. You need all your threads to be good in there and a good sealant on the pucks. I wouldn't stress too much about the O rings at this point, oh and while you're in there, pull the oil jets ( careful not to drop/lose them ) and clean them and use new 6x2mm O rings there, all 4.
Good luck, there's nothing worse than oil leaking from the pucks.
One more thing, block the cam chain channel with a rag or two while you work up there. HTH.
Oh, and one
more thing, when you remove the cover, oil usually will run out and down the front of the fins, try to be aware of this and mop up what you can, it is common that when riding the bike again you may get some oil on the side of the head fins again and think the problem is still there, if this happens, clean the #$%*e up and ride again, it may still get a "little less" oil on the fins, clean it up and ride again, depending on how much oil dripped into the front of the fins will determine how much blows out from the air pushing it around to the sides of the head. It should stay clean after this and you will be very happy and so will I
edit: Well it never ends, when retorquing the head don't forget the 4 x 6mm bolts under the pucks, it's a shame they are there otherwise I would advocate the welding up of the puck holes
