if the enricher is the choke, i tried that. didnt work.
This may be just a wild hare. We had another member who had similar problems that involved water (rain/ car wash)etc., everyone jumped at the obvious, and it turned out to be junk in his carb
instead of water in his gas or something else. Like you, he had used a fuel stabilizer in the past, and then quite for a few tanks.
I was just wondering, because you said when you got it going, you were able to get it to eventually clear up on the way home by running the enricher/choke pulled out(with the fuel cleaner/additive in the tank). I was thinking that maybe it wasn't the rain, so much as after arriving where you were and the bike sitting, something might have settled, clogged up or restricted the fuel flow somewhere along the line. There are alot of places where stuff can collect once it starts turning from a liquid to a solid in the fule system.
It's just something else to think about. Keep using the Seafoam on a regular basis. I try to use about two or three ounces in each tank. The ethanol, and these bikes sitting can be a real problem. If 5 or 6 tanks ago was last fall, and it was sitting idle for awhile, it could have been something sneaking up on you.
The restricted fuel, would have made the bike run similar to what you experienced.
I was thinking that if it was the air filter being wet, it should have started right away, or easier when you went back to get it, and then ran fine, once it got going. It could be, that it was the filter, and the plugs were fouled from running rich with the wet filter??? and they burned themselves clean finally??.
A rain cap in the future would stop that...but you said you used the rain cover which although its not a rain cap, it should have done something. The synthetic material in the factory rain bonnet should have shed enough water to protect the filter if the bike was just sitting. After all, it works when the carb is trying to suck air through it when riding in the rain.
It could also be water and electric issues, but I mentioned the horn thread that Rico started, because he was riding around in monsoons, in water deep enough to drown his horn, but didn't suffer any electrical problems running wise. It is possible, that water got into something, and then on the ride home it finally dried up enough so the bike would run fine again. Like someone washing their car engine at the car wash, and it running rough, until it dries out????.
With either a sluggish spark from a voltage leak due to the wet, or the saturated air filter, pulling the enricher, would have created a far richer situation, and flooded or fouled out the plugs....maybe, maybe not.
Anyway, when you went back, finally got it going, after adding some gas treatment(my guess is, the can said it absorbed water, and cleaned injectors or varnish etc.,), and after riding it with the enricher pulled out finally got it to clear itself up. The fuel additive may have helped to open things up a bit by dissolving the blockage, once it got to the problem area.
Anyway, just a thought
. Keep the Seafoam in your gas. Carry a shower cap for your filter, and maybe a small poncho, or trash bag to cover the tank and seat area, if the bike is sitting in the rain.
Whats the worst that could happen/...you'd have a dry seat to sit on after the rain, and everybody will see how clever you are with the shower cap, and your carb will stay squeaky clean on the inside by regular use of the Seafoam