
I have a UCD60 with that engine. I really like it. It doesn't overheat and it will hover nicely. I use 30% fuel, that will make the engine run cooler. Also, I'll bet you don't have enough airflow through your cowl. That is the problem with most. Attached is a picture of how I do mine. Open up the cowl and your problems will be over, I'll bet.
Thanks,
Barry