I have a 1999 ZR600EFI with only 1100 miles on the sled. I took it out for a quick spin and ran across the following problem. From a stop, when accellerating, the sled would bogg down and backfire. When riding the sled, The throttle response was very snappy. I just bought the sled in October and the sled had about a 1/8 of a tank of gas left in it. So i filled it up with 93 oct, but still seem to have the problem after 5 to 7 miles. I just put new carbontech reeds, goodwin clutch and a chip in the sled. Please, can anyone help.