Good afternoon friends. I have a 1990 Marlin with original Yamaha 200 outboards. Bought the boat Nov last year, and boat or motors haven't disappointed me yet, until today.I was trolling today, and a good friend wanted to fish, and he was about 5 miles south of me, so I pulled lines and headed toward him. Boat was running pretty much wide open for about 20 minutes, I picked him up, we went back out, opened her up, she ran for a bout 5 minutes, I started to back her down, and it sounded like I hit a stick or crab pot or some thing. I immediately killed the engines, tilted motors, couldn't see anything, both props spun freely, nothing looked out of the ordinary. When I started the motors back up , port was fine, Starboard was extremely loud, cut it off, waited til I limped back in, tried again and it starts to turn over for a millisecond, then stops. Sounds locked up. Now, any advice would be appreciated, about what it could be, about what price for new power head would cost, maybe a new set of take off. Thanks for any and all advice.Glen