Disconnect the battery. When measuring ohms there can be no power or you risk damage to yourself, bike, and or meter. Make sure that the pins are in the correct holes on the meter. Usually the black is in the bottom one (COM) and the red one should be in the middle. Turn the meter to the 1st ohm setting and then turn the meter on. Touch the probes to each other. (make sure you always keep your fingers behind the plastic and not on the probes) It should read 0. If not, move up to the next setting. Either way, for the primary it's usually the lowest setting. Touch the negative probe to the spade connector not in line with the spark wire on the coil and the positive to the spade connector that is in line with the spark wire on the coil. Take your reading. On VS650 it should be within 3.6-4.8. Then do the same thing but turn the dial up to 20k and touch the negative to the spark wire connector side and the positive to the inside of the spark wire to check the secondary. VS650 should read 10.1-15.1. Repeat on the other coil. Anybody want to chime in, please do.