Just after the warrenty ran up on my billy goat, the crank shaft base blow up. My vac has the 5hp briggs and when mated to the huge heavy vac/chipper blade it is way too heavy for the engine. It is hell to start, when you turn it off it takes a good 20 seconds before it stops turning...the whole time it is slowing down, it is smoking like crazy. To start it you have to pull it soo hard and slow that the machine wants to tip right over. Finally the engine had enough abuse and the base of the crank(holding the impeller) broke apart. And at 3500 rpm it make one hell of a noise when a 20 lbs impeller is spinning freely in a circular chamber. It sucks because i spent $1300 on a vac, and now i am screwed. If i replace the crank it will just happen again. $1300 down the drain.