Leaderboard

With a firing problem that is difficult to find, you will need a good meter and the electrical prints even if you have to buy them. The problem with trouble shooting without prints is you either have to follow the suspected wires from one point to another so you will know what connectors it goes thru, switches it goes to, and componets it hooks to and these wires are bundled with other wires of the same or close colors. A print will indicate connector, switches and other comonets such as cdi and coil.The problem is the cdi is powered from the ignition portion of the stator The first thing I check is the CDI voltages and cdi kill volatge which is only grounded in kill mode. If any of these are intermittent during this misfiring then you have to trace it back to where your losing the connection. It will be either the cdi unit, safety switches, on/off switch on handle bar, Main switch or wiring connectors causing issues like this to happen. Here is a not so good diagram of a 2004 400 articat. So as you can see this is a complex wiring system that without a correct wiring diagram it is next to impossible to troubleshoot. The firing is controled by the CDI but the Cdi gets it signals from the stator, sensors thruogh switches ets. You might print this out and have a better view of it.

Please check the magnets on the flywheel, if magnets are loose than replace flywheel. This is a very common problem on the suzuki 400 motor