This is my first "dirt" bike bike. 2008 WR250r. Went to drain the coolant, removed 8mm drain bolt and barley anything comes out, 1 drop at a time. Removed the hose, drained it that way. Flushed the radiator, put the hose back on, filled to flush the system and nothing comes out of the drain. Even turned it on for a bit to remove air and get liquid moving and still nothing.