Being relatively new to boating I am looking to replace my 2002 200 hp Mercury outboard with a 140 hp 4 stroke Johnson/Suzuki. The Mercury came with the Wellcraft I recently purchased. The engine is fine but have always wanted a 4 stroke. <br /><br /> Anyway, Is there a way I can trade the mercury in for the Johnson (like a car?) or do I have to sell it on my own/broker it.