Yes Rv7 and as RC Ken noted above to remember the ignition module, engine battery supply, second switch and charge jack for that battery and other attendant wiring. Also as the engine gets smaller these items do not.

The old advice that there is a demarcation line in aircraft size that limits a gas engine when compared in efficiency with a two stroke glow. Now with better engines this line well is still there, may have shifted a little but not much.

John