I am totally baffled here. To begin with, I thought I had clogged jets. Idle was erratic, lots of misfiring, and it would often start on one cylinder. I used a lot of Seafoam in the gas, soaked the carbs (on the bike) in Seafoam, and after riding it several hundred miles, it idled just fine. So I thought, ok, the jets are cleaned out. But it doesn't last. Several times after that, the symptoms would reappear after letting it sit for just a few days. If started and ridden every day it would be fine. Since it can't run fine if the jets are plugged, I'm assuming they are not. Can they really get plugged up after sitting for just a few days, even with Seafoam in the gas? Or is there something else going on here? Carb and gas tank venting are fine. It acts exactly like the jets are partly plugged up, until ridden for a while. I'm getting ready to throw in the towel and buy a Honda.