Ok Lets see if you can help me on this one. I just put an 06 zzr600 engine in a 07 zzr600 frame. its carburated. I know im getting fuel to the carburter , but im not getting spark. plugs are good. I checked the IGN sensor it has battery voltage. I checked the coils and switches the only thing that was wierd was that I got power at the coils , but the plug going into the harness that connects to the spark plugs no power which doesn't make sense to me cause how can I have power at the coils right? and then when I pull the clutch and try to start it not even a sound comes from the bike even when its in neutral or any other gear... Try to start with the clutch out, you can hear it turn over. I took the crankcase sensor out of my old engine and put it in the 06 and still nothing cause I thought that might it. When I put the engine in the bike I replaced the cylinder head on it with the one on the orginal engine used the bolts that were with it cause I know they are like machined to that head pulled it at TDC and properly torqued it. the camshafts were all lined up to keep the timing. so I can't come to any good conclusion. I checked the kickstand sensor, neutral safety switch and the switch that connects into the clutch.