Tantel is referring to the Briggs Fource 34cc and 40cc weedeater engines.

I have not seen any of the 40cc advertised recently. Have you thought about a Honda GX35 or a Fuji 35cc instead? Both are more expensive than the Briggs but produce more power. The Fuji is found in Robin and Makita strimmers in Europe.

Conversion parts for the Honda are available form Carr Precision, not sure about the Fuji any more.

I have the Briggs 34cc, Honda and Fuji converted for aircraft use so if you wish to see photos send me your email.

If you want more than 40cc, there is the Stihl 65cc that Ralph Cunningham and others have converted for aircraft use.

You will find information on all these conversions on RCU - just do a search for each name.