New to the forum, dont Shoot me for wanting to put a 4 stroke on my lawn boy, its only for future reference should I ever have to replace the engine. I searched around and saw mention of an adapter plate to run a say, 5hp briggs. Anyone know off the top of their head what is needed? It currently has a 4.75hp 2 stroke on it. Any help is greatly appreciated! BTW, this is my first lawn boy and it is a great mulcher!