I have a 97 ZRT 600 and it just started running on only 2 cyl. First step was putting new plugs in, ran it for a bit, pulled the plugs and the one on the clutch side was pretty much dry, and exhaust is cold. Swapped fuel line with the centre carb to check to see if it was the fuel pump...SAME. Took carb off and reeds, everything seemed to look OK. Checked the compression to see if there was a gasket gone, all reading about 100 psi. Any other suggestions?