Yamaha 1.9 Litre: Power Missing or Throttle Response Sluggish

The new 1.9-litre generation is supposed to pull hard. If it feels weaker than expected or hangs on the throttle, it is worth looking at the numbers M-JET DIAGNOSTIC reads from the control unit.

What you record

• Intake pressure (code 29) and engine speed at full load
• Throttle valve angle against throttle lever position (TPS and APS)
• Intake air temperature (23), engine temperature (15) and thermo sensor (41)
• Ignition timing and knock sensor messages (17)

Classification

If the control unit pulls power back, there is usually a reason in the fault memory or the temperatures. If the throttle valve does not follow the lever, you look at APS and TPS. Also check whether a mode with limited power is active, such as no-wake or a learner mode. If all values are unremarkable and the craft stays slow anyway, the cause is often in pump, impeller or inlet, which a diagnostic tool only shows indirectly through engine speed.

Related topics

• Yamaha 1.9 Litre: Overheat Alarm, Sensor or Water Path?
• Yamaha 1.9-Litre FX, GP and VX (from 2024) Fault Codes: List
• Yamaha WaveRunner Power Loss: Finding the Cause
• 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.