Hertenberger or something like that. There was a thread just this past week end on the same subject. If you need parts, MECOA has them. They are in California. They bought the rights to the engine and make all the parts. They are good engines.
Look up MECOA on Google.
Here's the other thread...
http://www.rcuniverse.com/forum/m_3612106/tm.htm
Enjoy,
Jim