My 2003 Yamaha R1 is slipping in 2nd gear ONLY under hard acceleration and only in 2nd gear. I'm hoping that is not the gearbox but I am thinking you all are going to tell me it is. The clutch is original and 7 years old now. The bike has roughly 15,000 miles on it now. What's everyone's opinions on this? If it is the gearbox is it best to buy a new one or pay to get this one rebuilt? I also loosened up the chain some but it did not work.