My EF 68" Yak is 8lbs 9oz with a YS 1.10 - fuel.. A real floater and a super performer.. I knife edge all day without mixes.. Everyone drools at it... The owner said he flew one with a RCS 140 (small gasser) and it flew nice just not as much power as the YS.. With the expense of glow fuel a small gasser might not be a bad Idea.. A small gasser can't out vibrate my YS thats for sure...