Was told my water pump gasket gave out causing my coolant and oil to mix. Now the shop wants to rebuild my whole top end new valves and all. Bill is almost 800 bucks in OEM parts alone. Here's how I found out something was wrong. I was riding and bike died. Couldn't start for 15 minutes. Got it to start and it ran fine for 5 minutes than died again and was hard to start again. Oil was coming out of the overflow hose all the way back to truck. Friend said he could smell burning oil while riding behind me. Am I getting the shaft or does this sound right?