RM125 Rm 125

Having trouble getting my bike started. Its a 1999 suzuki rm 125. It has spark compression an fuel. New plug fresh gas an carb is clean. Clutch is smooth. Gear box oil is milky. Witch is the only problem i can find so far. It started an ran great now wont start. Tried using starting fluid to no avail. If i just replace gear box oil in bike could that solve the problem? Or replace head gasket? Im a new bike owner an dont know right where to start. Any info will be helpful thanks.
 
Having trouble getting my bike started. Its a 1999 suzuki rm 125. It has spark compression an fuel. New plug fresh gas an carb is clean. Clutch is smooth. Gear box oil is milky. Witch is the only problem i can find so far. It started an ran great now wont start. Tried using starting fluid to no avail. If i just replace gear box oil in bike could that solve the problem? Or replace head gasket? Im a new bike owner an dont know right where to start. Any info will be helpful thanks.

How much compression does it have?
 
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