i just got ahold of an 89 zx 10, it was running but was running very rough, i cleaned the carbs and got it going pretty good, and then when the motor FINALLY started to sound good, and idle it locked up! it had and it didn;t seem very hott, so what do i do now? break everything down and go from there? what could be the problem? i took off the valve cover and everything seems to be fine in there, and i loosened all the bolts for the cylinder but i cant get it off...???

i am really new to 4 cylinder motors, i have been into dirtbikes and 4-wheelers for a while, so i need lots of help!!![&o]