Richard, The total weight including the wrap-around muffler, ignition system, ignition switch, and ignition battery (750 mah NMH) is 42 ounces. I use a micro servo and mount it on the firewall and only run a 10 ounce fuel tank to keep weight down. Here are the specs from Sig.
http://www.sigmfg.com/cgi-bin/dpsmar...FV4.html?E+Sig
Harry