Ranger, not at all.. Imagine you take a harley. And customize it and upgrade[b] ( ) it by putting in a duccati racing engine. Surely you would need to tweak some things here and there, but the bike will work! The same goes for changing duccati engine later on in life due to some pressing need to a yamaha one.. Just minor tweakings.. Not a train smash. So i dont feel merely changing the engine is sufficient to pound the whole bike (i.e grounds for breaking marriage).