Hello everyone. My bike (1999 WR400F) has a major problem. It barely runs. When it finally starts it will die again at idle. It crackles, sputters, backfires, has no power, and the plug is fouled with black, dried carbon. I think it may be an ignition problem so I checked the ignition and stator coils and the throttle position sensor and they all seem to be ok. So my question is how do I test the CDI unit? If you know how to test it or have any other ideas of what may be wrong your help would be appreciated. Thanks!