Thanks, That is effectively what John McBean told me. It is good to get the same answer from two sources. Since, I have never had a plane with a Rotax before, I didn't want to risk damage to the exhaust valves, or the heads. So, on base, and it was still squawking, I just declared an emergency, and landed it. It was already getting late, the sun was setting, and I knew it had to be a short pattern flight to test it out. I'll try again today to see if it was just burning off the C _ _ _ , from sitting so long!