Hello I have a Scag sw48ka belt drive walk-behind i think it is a mid 90's and i am wanting to upgrade the engine right now it is a recoil start (actually i rap a rope around where the recoil used to go) but anyways i want to know what engine i can just unbolt/bolt on. The blades are manually engaged and there is nothing electric on it. I want a 17 hp or maybe even another 14hp recoil start. what engine's do you know of that i could just swap out? any help would be greatly appreciated thank you.