I just took my WR 426 out for it's second ride. I changed the oil and filter for the second time. I let the bike idle for about 10 to 15min. to let it warm up prior to checking the oil level. The radiator boiled over spewing out of the overfill tank hose. Is this normal for the WRs if let idle for this long? it was about 45 degrees out. I loosened the nut at the head to confirm the oil was cirulating. The bike ran fine during both rides. Each ride was about an hour long w/some tight trails in 45 degree weather.