I have a 2002 ZL600 esr I bought this past fall with about 920 miles on it. This past weekend I was riding with my friend who has a 2002 ZR600 efi with 1100 miles. The ZR600 pulled much harder/faster, especially anything over 40mph and just overall quicker. The ZL600 only weighs like 35lbs heavier, so why is the ZR600 so much faster? Everything I can find is that they are the identical sled except for shocks. They are both stock sleds, but does the ZR600 have different clutch springs and weights setup? Want to make my ZL600 pull like the ZR600.