I have an 02 ZR 600 CC efi, I rode last weekend with no problems, it was around zero, but I took it easy all day until the sled warmed up. Well I took it for a quick spin (about 1 mile) friday around the house. Saturday we went riding (after letting the sled warm up for 10 min.) and the sled seemed to be running on only 1 cylinder. Changed plugs twice, no good. I also noticed a little oil seeping out the right side nut on the base. I brought it to Sun & Snow first thing and lucky me a factory rep was there. He loosened the nut put it back on and said the sled runs fine. He held the throttle wide open then jammed on the brakes. Not wanting to argue I took the sled home (the factory rep should know what he is talking about, right?) Well same thing, I get 1/2 throttle and there is NO power, the sled sounds like it is breaking up. Any thoughts or past experiences? I have isopopyl in the gas with 3/4 of a tank, both plugs are getting spark, the right side, (the one with the oil leaking out of the nut) the plug is black, while the clutch side is pefectly tan. Any input would be appreciated.