I found this from back in 2004, No Comments. The Cam Chain for the 87 XR600 & 93-2000 XR600. the 93-00 chain is much smaller but they both show 118L. 1) What Year did the Cam Chain, get Smaller. 2) Will the Larger Chain, Fit the later years? 3) What other Parts, need to be Changed? 4) Has anyone tried this Upgrade?