I'm new to the WR400 so I know nothing. If I leave the bike running in the garage for 20 minutes or so, when I come back to it it smells really hot...like something is burning. The coolant tank is very audible with boiling water/coolant and a mixture of coolant and oil has leaked on the garage floor from the plastic tubes at the bottom of the bike. Is that normal? I also notice this when riding hard (hard as in high rpm's). Should I be worried or write it off as normal operating procedure?