I've got a Yamaha engine that has thrown two pistons since I've owned it, and I'm the second owner. I rebuilt it and two or three seasons later it'll kick another. I'm done. Wanting to upgrade to a Mercury since people seem to run those for years, but don't have $16,000000000000000 for a new one. How do you guys that trade boat engines like socks find deals on second hand engines? I'll need 175 horses and the controls, since i'm swapping over from a Yammy.