RE: 24cc Echo conversion
Coil and machined flywheel weight is about 449 gr (15.8oz) - this is from the different engine, but it is pretty much in the ball park.
You probably will end up with the weight of the engine that is about 1554-449=1105gr
I have ST90 (Italian version)and with the mount it's weight is about 697gr plus 134 gr for the muffler and the total is 831gr
May be AV8TOR would comment on the gas/glow and no flywheel and coil conversion