The 150HP 1993 PRO-V Yamaha on my Ranger connected with a 'dead-head' an underwater tree, in an idle zone. There was a pretty loud bang, and I was startled, but the motor seemed to keep going OK. W<br /><br />When I got to the fast side and throttled down, the boat accelerated, then rev'd up high and lost power. I Stopped, looked at prop and lower unit, all looked well. Went again, same problem.<br /><br />I discovered that if I gradually throttled down, that I could achieve plane and even top speed, no problem. However, if I still tried to hammer it out of the hole, it would rev up and have almost no power. <br /><br />I've spun a hub before on an older boat I had, and this seemed to be a classic case. I continued to run for a few months, just with terrible hole shot, just figuring the prop hub was getting worse and worse. <br /><br />Finally got the prop sent off last week. Just got word back from the shop who sent the prop in that nothing was wrong with the hub, and I thought for sure that would be the case. I don't have a spare that I could test with or I would. What's worse is that I'm supposed to go on Vacation with the boat tomorrow!! Am I looking at a drive shaft problem? Splines from prop and shaft look A-OK. <br /><br />Any ideas? Welcoming input,<br />AP