Hello, i bought my bike used its a 2000 rm 125, and i had it for about 4 months...right when i bought it the oil was always had a grey color to it with aluminum shavings, and i thought it was normal, but its not, can anyone tell me what could be the problems and where the aluminum shavings are coming from?? i took apart my clutch and its fine, im not sure if i need a new head gasket, water pump, or bearings...please reply on what you think.