Put on a new set of chain and sprockets before heading to the track yesterday. Chain is a D.I.D VT2 520 chain. Paid $100 for it. Thought it was a good quality chain. Rode about an hour total time(5 to 6 ten minute motos) and the chain streched ALOT. Chain slack was perfect when I left the house and was waaayyy to loose when I left the track.. 1. How much should the chain stretch on the first ride?