Yesterday my '05 C50T was delivered to me. I drove it the 10 blocks to work and back home. Today, I rode it for 53 miles, when the engine began to clank and the check oil light came on. I checked the oil and none was to be seen in the sight glass. I had to add two quarts to see oil in the sight glass. The engine doesn't clank anymore. It just clicks. And the oil in the sight glass now is foamy on top. I'm upset. I think that, maybe, the dealer didn't fill the crankcase during prep. Should I demand a replacment bike?