Futurase,

18oz!!!! holy carp!!! I do not know what the YS 120 weighs but wow it must be light. I have a OS 1.60 in mine with the fuel cell over the CG and moved to a Pull-Pull system bringing the rudder servo back into the fuse. I have 2oz of weight up front, the YS 120 weighs 1.2oz's less than the OS 1.60 so I don't know why all the lead needed. Now before I moved the rudder servo I had 11oz up front. amazing moving that little 2.2 oz forward into the CG removed all that lead.

As for the gas vs glow and power ratio thing all I can say is big gas makes big power, small gas makes small power.. All gas is usually more reliable than Glow, but in my opinion and probably mine alone.. No gasser that has an equivalent Glow size displacement outpowers the 2 stroke glow guzzler. Same principle they are just now overcoming in the motorcycle world. It will soon come to pass that the gassers outdo the glowies and by then I'll be a gasser