NIGHTMAREAegis Powersports Extended Service Contract continues to stonewall me. After presenting them with specs on piston rings being out of spec., they again responded with the "poor fuel" excuse for the massive carbon buildup. They also said there is a normal and acceptable amount of oil leakage and fuel that gets into the chambers taht causes carbon buildup. So what I am getting from Aegis Powersports is that it is normal for this engine to have to replace the rings, valves, valve seats, have the engine broken down completely and cleaned every 16,000 miles. That is with using 91 octane fuel and doing regular oil and filter changes. I am going to speak to the owner of the dealership North County Yamahas in San Marcos California soon and see if he will stand behind the product the dealership sold me. The product that apparently doesn't run on California gas for more than 16,000 miles.