-replaced the rings,
-honed the cylinders,
-dipped/cleaned the carbs and replaced o-rings,
-did a full valve job,
-balanced the carbs.
-replaced the battery (and it has a full charge, no cranking problems)
-cleaned/oiled the air filter,
-cleaned all the ground connections
-cleaned all the wiring harnesses
-replaced spark plugs (~1000 miles)
-checked/fixed valve clearance (checked this again today)
-checked compression (170-185 in all 4 cylinders)
The background:
A couple months back I took about a 100 mile ride. On the way back I ran into rain and shortly after the bike lost power and stalled. I could usually restart it relatively easily, and I could get RPMs out of it almost like normal, but I had virtually no power. If I took of as I normally would, the bike would stall. I'd have to ride the clutch to get going. After that I could get up to speed slowly, but had virtually no power. Finally the rain cleared, and afterwords the bike got better and I was back at full power.
A few weeks later I parked the bike and it got rained on. Again, I was able to get it started, but it had virtually no power. It was a light rain. Riding back, sometimes the bike would kick in and take off like a rocket for a second or two, then I'd be back to putting along with no power. This happened several times. I let the bike dry out overnight and it was fine the next day.
Someone suggested that it could be one of the coils that was cracked. Today after I checked valve clearances and buttoning everything back up, I poured a bit of water on one of the coils. No change in idle or response from the throttle. I then poured some water on the second coil, again, no change. However, about 30 seconds later, the bike sputtered and coughed and stalled. Again, I was able to get it started and could rev the engine and get more or less normal response out of it, though it did want to stall a bit. I tried riding it around the block and again I had virtually no power. Even after letting it run for about 5 minutes, it still wasn't running correctly.
I should also mention that I've been riding the bike all season with really no problems other than the lack of power in the rain. I've logged at least 1,000 miles, and as long as it's dry, I'm fine. The bike starts up quickly, has a decent amount of power, responds pretty well to the throttle. As soon as it gets wet, though, I get no power.
Any ideas? Not only what it might be, but also how to determine and verify what the problem is? A list of things to check?
Thank you!
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