My cam chain tensioner is all the way out, and my chain jumped time yesterday while pretty much idleing. I just put a new cam chain on from Yamaha. Was it to tight and I stretched it? Is the guide worn? Or was the cam chain I got off eBay not genuine even though it was packaged from Yamaha/genuine chain. It was tight when I put it together. Now it's loose. Also I tightened it super tight then backed maybe half turn off and left it. Not sure what to do. Seems a little loose to me to ride it especially because the tensioner is already all the way out.