Had my 2016 YZ450F boil over on a 90 degree day while trail riding. I did my best to shut the bike off when stopped, but at the end of the day it still got too hot. I ended up replacing it with the boyesen, which I have heard great things about. I was surprised to see that the OEM water pump was plastic and very small. Previous years it was aluminum. Wondering why they changed it up. Anybody else have overheating with the 2016s? I'll report back on how the boyesen is.