Re: johnson 9.9 4 stroke
In 1998, Johnson built two different 9.9 4-Strokes, a 211cc and a 305cc. Both use a cdi ignition system, neither requires 12 volts to the power pack. Both systems use a charge coil, which produces the operating voltage which fires the plugs. The smaller one uses a sensor coil to control spark timing, the large bore uses an optical sensor, which is powered by a power coil. <br /><br />The appropriate service manual and test procedures are required to trouble shoot any ignition system or, you're just going to end up replacing parts until you hit the right one.<br /><br />A total "no-spark" situation can be caused by the stop circuit (the switch or the wiring), no output from the charge coil, no output from the sensor coil (or optical sensor), or a bad pack. The big-bore with has the optical sensor built into the pack.<br /><br />What do you have??<br /><br />-John
