well what i thought was bad plugs has to be something else, i have a 00 cbr 600 f4 and it wont start it fires or tries to at least but it sounds like maybe one or more of the plugs aren't even firing.. it has a muffled pop sound every few cranks and thats it.. any help or info on what i should look into checking out next would really help im no pro by any means but would rather wrench on it myself so a bit of guidance in the right direction wold be much appreciated..!

 

Start the bike up for literally 2 seconds or less. What you want to do is to feel the temp of each header to see who is cold and who is firing off to make heat at the header. And that is to wet your finger, stab the pipe that is closes to the head. This flame front will cook a pipe up, show you the cold pipe is a bad plug if you have spark and compression out of the way.