hello , i own a yamaha tzm 150 lately i have serious problem with the engine . my black oil turn to white in colour and cm out from overflw...radiotor water is empty after a long run i believe it goes in engine......thn my powervalve not working properly.....i have send to many workshop bt the prblm is cmg bck......now a day i feel so bored with the bike performance it not like before ..... wat should i do guys..?

This might be the water pump seal has gone

Welcome virakumran " well head gasket was the obvious culprit, but shurly them many workshops shudda fixed that,, so pump seals are next , as he says,