Hello there, first time posting here and hoping for help. At this point I'm pretty desperate to fix my bike but haven't found any answers online or from my mechanic. Bike is a stock 78 cb550K and it's blowing white smoke out of number 2 exhaust. This happens after riding it for 5-7 mins when the bike is up to temperature. It only happens about 7-10 seconds after coming to a stop. So idling at a red light, for example, the bike is spewing white smoke. Can't tell if it has a fuel or oil smell, but it has a smell. Mechanics checked compression and all cylinders are reading well. So it can't it be valve stem seals or piston rings, or can it? They cleaned the carbs in august last year and it was stored correctly over winter. I installed a Dyna S ignition recently but the smoke was blowing before that so I think it's irrelevant. Internet says white smoke is oil but my mechanic thinks its fuel. His recommendation was a stuck float needle but I've checked those and they seem fine, albeit on a cold bike. The bike starts well on choke then I can get it to a nice idle fairly quickly. The throttle can be a bit choppy under acceleration when I haven't ridden in a while but that usually clears up about 5 mins into the ride. If anyone has any info, please point me into a direction. I can't take it to the mechanics cause I've got no money since the pandemic and so I'm hoping to fix it myself or I'll have to reluctantly sell. Thank you!