Hi, we are having a issue with our Johnson 50hp..... We started it on muffs on Friday and it started first go, put it in the water on Saturday and no go.... Won't start.... Lots of white smoke coming out of the exhaust relief and when we lifted the motor cover white smoke was coming out from under the power head :facepalm:...... The motor will crank but it won't turn over.... It has spark and great compression.... And we were using the same fuel as the day before.... When we got I home we noticed black watery grease coming from under the prop... Which has not happened before.... We ave previosly put the boat in the water twice before this and no go either... But the first time we put it down to a sheared flywheel key and the second the started had jammed up... Each issue has been fixed but still can't get it to start in the water 
..... Does Anyone have any ideas
..... Does Anyone have any ideas