Konig parts are near impossible to find....except for the new one which is big $$$
I think a new Konig 430 costs about $3500.00 since they are basically custom made one at a time.
You want to use one of these:
Zenoah G-25: http://www.tn-prop.com/g25b.htm
Hirth F-33 or F-36: http://www.recpower.com/F33.htm
http://www.recpower.com/f36.htm
Simonni: http://www.simonini-flying.com/mini3_eng.htm
KFM 107: http://www.homebuilt.org/vendors/powerp ... luppi.html
http://www.aerosviluppi.com
I think the Zenoah G-25 is the most inexpensive and common in the US.
The Hirth F-33 has 1000 hr TBO and is not to pricey & F-36 is not to over powered and is lighter.....I'd say these are the best quality bang for your buck.
KFM's are not produced anymore but I think the links above still have parts and used engines available.
Ray