I have a 2004 kx 250 and i took it out and started it, it started 1st kick and i let it warm up, it was running slightly rich but i think that is because the choke was up. Then i switched it off to put in the new spark plug. then it wouldnt start. so i put the old plug back and the nothing... checked spark and there was nothing on either of the plugs... then i tried to find the cause of there being no spark. found a loose ground cable, tightened it and still nothing... swapped out the started coil with a spare i had and still nothing. i took apart the kill switch to see if it wasnt sticking, and it was fine. and i checked all the electrical connections. any ideas on how to test the other electrical components? or what else the problem may be?