I just got my 500 back going again. It sounds unbelievably nasty. now heres the thing it heats up and gets hot pretty damn fast. Is this normal for a 500? I am afriad of having cooling system issues. Coolant levels vary inthe bike, and the gear oil has always looked a bit milky. Thing is I dont think that were losing coolant because the levels stay relatively the same. could the heat issues be oil getting into the coolant? Motor just got all rebuilt and I dont wanna have to do that again because we seize it up again. Coolant system pressure check? Thanks guys.