I have a CBR600FV I'm learning to track ride on. I have noticed a behaviour when exiting turns hard. When I get on the throttle hard while still leant over a lot I get a wavering feeling from the back. It's as if the swingarm has suddenly developed a lot of flex and is gently swaying from side to side, which is half up and down as the bike is leant over. It's quite a slow movement maybe 3 to 4 times a sec. If I ease off the throttle a little or reduce lean a little it goes away. It doesn't feel that bad but being inexperienced I am not sure if it's a warning or just a bad behaviour that can be tuned out. I can't detect any play in the swingarm or wheel bearings. At the moment I am treating it as a warning and not pushing harder but wondered if it just means wrong tyre pressures or damper settings etc.