I only hope it's not warped.
Symptoms:
Spitting coolant after being run (very) hard, wait till it cools, top up radiator, empty coolant overflow and next time it's run hard, it pukes coolant again.
Riding normally with a full power pull here and there is no issue, its when I'm wailing through mountains keeping the motor over 3000 RPM all the time that it pukes a bit of coolant when I turn the bike off.
Running great, pulls very hard, hard enough to pull up to 170 easily yesterday before I ran out of road, and generally is running perfect...except coolant puking more than normal. Plugs - dry, Oil - looks like oil not milky at all, Coolant - green and not chunky or anything, fan - working turns on at 97c.