2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 254Get this manual
Ignition System:
No Spark or Poor Spark
Troubleshooting NOTE
B933H21804002
Check that the transmission is in neutral and the engine stop switch is in the "RUN" positionCheck that the fuse is not blown and the battery is fully-charged before diagnosingStep Action Check the ignition system couplers for poor connections2 Yes Go to step 2No Poor connection of couplers Faulty ignition switch Faulty engine stop switch Broken wire harness or poor connection of related circuit couplersGo to step 5