Pull off any parts with O-rings and other non-heat safe parts, put the engine in a 325°F oven for 20 minutes, remove the engine with an oven mitt or rag and tap the engine on a block of wood. The bearing should drop right out. If not, it should be easy to push it out with a screwdriver, etc. Be careful not to scrathc/damage the engine case where the bearing goes.

Jack