I noticed this a few rides ago. Bike fires up on 1st or 2nd kick no problem, idles great, but stumbles around for at least 2 or 3 mins when I start to ride. Doesn't matter if I'm 1/8th throttle or full throttle, it stumbles. I idle it for a few minutes and then check my oil before a ride so the bikes isn't cold when I take off. If any of you are familiar with taking off in a cold VW Bug/ Bus/ buggy and know that sluggish feeling, that's almost exactly what's happening. It misses, hicups, burps, whatever you wanna call it. I thought it was bad gas because I hadn't ridden the bike for a while and when it all of sudden starting running great after adding new gas I was almost convinced it was the gas. It happened again recently and did exactly the same thing. After about 3 mins it started running great and I rode for a good 90 mins w/o any issues. Again, thought it was the gas because I just don't ride as often anymore. Brought the bike home and changed oil/ filter, cleaned air filter, and pulled tank and emptied it. I got it all buttoned up and added new gas and took it around the block and same thing happens. It's not the gas. Just put in a new plug and no change. Anyone else ever experience this? If so, what was it or what should I start focusing on?