Yamaha FZR and FZS: Overheat Warning and Limp Mode

Supercharged engines react sensitively to heat. If the FZR or FZS reports overheating and reduces power, M-JET DIAGNOSTIC shows you which measuring point supplies the trigger.

What you compare

• Engine temperature (code 15) over time
• Exhaust manifold water temperature (code 65)
• Intake air temperature (code 23)
• Thermo switch and oil pressure switch in the switch status

Narrowing down the trigger

If all values rise evenly, check cooling from the inlet to the pump. If only the intake air temperature rises, the charge air side moves into focus. If a single value jumps, its sensor or wire is suspect. Do not ride on if the overheating is real. On supercharged engines that can quickly get expensive. Known from forums: the cause is mostly in the water path, for example a clogged exhaust water hole, blocked manifolds after poor flushing, intake grate or impeller, and less often in the sensor. These engines have three temperature devices: exhaust thermo sensor, thermo switch and engine temperature sensor. If the sensors show normal values while the alarm sounds, thermo switch or water flow are the better suspects.

Related topics

• Yamaha FZR and FZS: Knock Sensor Message and Intake Air Temperature
• Yamaha FZR and FZS: Check the Intake Pressure Sensor (Code 29)
• Yamaha WaveRunner Overheating and Temperature Sensor
• 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.