I have a 2007 Kawasaki ZZR 600 that I just recently bought with about 4k miles. It's my first bike and i'm typically always paranoid about something with it. When I bought the bike, the owner said it sat in his shed for about a year so I dumped the old gas out and went to get the carbs cleaned. When I go to warm up the bike ill leave my choke at about half way which throws the idle up to 3k to warm up, and I leave it when im sitting at around 1300 rpm's with the choke off. Today I think I left the choke about 1/5th - 1/4th of the way on accidentally while leaving work. I got to my first stop sign only about a minute after warming up the bike, and randomly it shot up to 6-7k rpms and I thought the thing was going to explode. Quickly I put it in neutral so I could make sure the choke was turned off, and even when it was the rpms wouldn't go down so I eventually had to hit the kill switch. After turning my bike back on I didnt have the issue anymore, but im afraid something similar will happen again. Any ideas on what could cause this, and what I could do to fix it? I feel like I need new spark plugs maybe but thats just a wild guess.