First off my pb-80 has approx 2,000 miles on it all this year. Have been running it with 8 weights in each puck. Took off from a dead dig racing for a minute and got up to 100 or so and got an instant vibration (Felt like I was starting to blow a belt). Checked out the belt and all was good so I thought maybe I caught ice up in the track. Took back off and vibrated for a min and then quit so I figured it shot ice out which I thought it was. Go another half mile and the sled has no throttle response and only going about 60 wide open and no rpm. Stop to check it out and the primary isn't disengaging. Decided to start it with the track off the ground and then just jump on it when it took off to limp back to the house. Had to stay above 40 or it would want to bog down and lock up. About 3 miles go by on the way back and all of the sudden I hear a huge bang and the sled starts free reving. Get off and look and right behind the sled half of a puck is laying on the trail. The cover on the primary is intact along with clutch bolt and nut. Shot the puck thru the belly pan is what looks like happened. I am 100% sure the pucks were installed correctly to rule that out. Any insight is greatly appreciated. Plan on making a phone call to Cudeny tomorrow. 2 bad weekends in a row is getting old now lol. Thanks in advance for any thoughts and help.