YAMAHA OUTBOARD WONT ACCELERATE FOR DUMMIES

Have got a 2012 Yamaha F150XA with 300 hours. Was out the opposite day and also the oil gentle arrived on. I stopped and checked the oil and it was fantastic. I limped it to shore and no heat light came on. The motor wound up not turning above. I took it to the Yamaha dealer plus they said it's frequent with the F150XA outboards. Apparently Yamaha