Have Boat Questions? Ask a Boat Repair Expert.
Good morning, my name is ***** ***** am I speaking with?
There are only 2 ways to know. The first way is by engine serial number. All Mercury engines are cataloged by serial number, if you can get me that number I can run it and tell you the rotation. The other way is to have a helper crank the engine over and see which way the front pulleys are turning. If they turn clockwise they are LH engines. If they turn counter clockwise they are RH engines.
That being said, was there a reason you needed to know this? Did you need parts for it or something like that?