M-JET DIAGNOSTIC · YAMAHA

Yamaha WaveRunner Power Loss: Finding the Cause

The WaveRunner no longer revs properly, hangs on the throttle or does not reach its usual top speed? With M-JET DIAGNOSTIC you record the values while riding and see where it falters.

What you look at

  • Throttle valve angle compared to accelerator position
  • Intake pressure and intake air temperature
  • Ignition timing and injection duration
  • Engine and exhaust manifold water temperature
  • Battery voltage under load

Mechanics or electronics?

If power drops because the control unit reduces it, the fault memory usually holds a hint, for example on temperature, knock or throttle valve. If there is no entry, the cause often lies in the mechanics: a fouled pump, a damaged impeller, a dirty intake area or fuel quality. The test ride shows you the difference. Power loss without a fault code is a reason to check pump and intake.

Related 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.

You also ride a Sea-Doo or Can-Am? The M-JET DIAGNOSTIC is available for BRP vehicles too.

To the M-JET DIAGNOSTIC for BRP ›