ORIGINAL: RVM
Do you have any pictures of your set up? The smaller size might be a nice thing.
I really wish I could find the weight of the various engines with all the support equipment.
Extra 260 thread from Bass1:
http://www.rcuniverse.com/forum/m_4241566/tm.htm
50cc class engine weights (real ones, not marketing BS):
http://www.rcaerobats.net/GAS_ENGINE_WTS.htm
I like brunette's myself...
Enjoy,
Mark