Greg, the new beam mounted RCGF 26 is an entirely different engine from the previous 26. It's BRAND new, and a bunch lighter. Very few have been sold. For all practical purposes, externally it's a twin to the beam mounted 20cc engine.

Way off DLE topic here, but there's a dedicated RCGF string with more new BM (beam mount) 26cc info here:
http://www.rcuniverse.com/forum/gas-engines-142/7823494-rcgf-engines-241.html

Last off topic thought, I've had very good luck, with multiple RCGF's.