I have the 2007 450 EXC and every now and then when it's warm outside and especially at altitude the pumpkin starts spewing coolant. I am in technical, steep, and slow conditions when this happens. The first time it happened I thought my bike was done. I researched and found that these high dollar bikes don't come with a coolant recovery system or cooling fan and so they puke from time to time. I have installed a Coolant Keeper System recovery tank (Works great!) but wonder if the cost of the cooling fan is worth it for the few times I experience overheating?