Been there, done that with my old ride. Check out this cool blog post I stumbled upon about mini excavator weights: https://www.boomandbucket.com/blog/how-much-does-a-mini-excavator-weigh. It might come in handy for your. As for the engine swap, I swapped mine with a gutsier one a while back. It was like giving my ride a shot of espresso - woke the whole thing up! Not sure about F244 specifics, but if you're not into extreme mods, there's gotta be a sweet spot. Maybe someone here has some golden nuggets of wisdom to share.