Yamaha EX Won't Start: Check Voltage, Relays and Cylinders

The EX does nothing at the start, or the starter cranks without ignition. With M-JET DIAGNOSTIC you get there in seven tests, because the EX has seven components you can activate.

The tests

• Battery voltage at start
• Relays and kill switch in the switch status
• Activate the fuel pump
• Activate ignition coils 1 to 3 and injectors 1 to 3

Why a system saves time

With the pump, three coils and three injectors you check all parts that affect starting in a few minutes. If one does not respond, it is the candidate. If all respond, you look in the fault memory for camshaft and pulser coil. A weak battery is the most frequent reason on entry models after standing idle, so the voltage check always comes first. On the fuel system: good ventilation, no ignition sources. The kill switch on the handlebar can corrode and stop the craft or prevent starting: its state is in the live data.

Related topics

• Yamaha EX: Engine Stalls at Idle or Hunts
• Yamaha EX, EX Sport, Deluxe and Limited: What the App Shows per Variant
• Yamaha WaveRunner Won't Start: Diagnostics
• Diagnostics and fault codes for your Yamaha model
• All Yamaha WaveRunner diagnostics topics

Everything runs via app over Bluetooth, for Yamaha WaveRunners from model year 2002 to today. Learn more about the M-JET DIAGNOSTIC for Yamaha WaveRunner.