I'm fairly new to the motorcycle scene and even newer to the home maintenance of them. I changed the oil on my '05 WR450 today. after putting all bolts and hoses back together, I ran the motor and decided to buzz up and down the alley a few times. When I returned and shut the bike off, the coolant in the radiator and the rear bottle was boiling! I've never had that happen before. Can anybody tell me why that might happen? All coolant and oil levels are as they should be. I cleaned the strainer and replaced the filter. HELP!!