I'm new to large powered planes and have gotten a (mostly) framed-up 1/4 scale Sig J-3, along with an elderly Ryobi 31cc 'strimmer engine. Are there still conversion bits available for this engine? Is it worthwhile to use it once converted, or should I look elsewhere? I mostly fly slope (and electrics with my son)- with no interest in glow at all, but I sure do like big'uns.