Yamaha SuperJet: Overheating in Shallow Water and Sand in the Inlet

Stand-ups are often ridden in shallow water, where sand and small debris get into the inlet. If the SuperJet reports overheating, M-JET DIAGNOSTIC shows whether the heat is real.

What you watch

• Engine temperature (code 15) and exhaust manifold water temperature (code 65)
• Curve at idle and under load
• Fault memory for active temperature codes
• Battery voltage as a side check

Real heat or false alarm?

If the values rise plausibly, cooling water is missing and inlet grate and pump deserve a look. In forums on Yamaha overheating messages it is also mentioned that shells, stones and sand can sit deep in the cooling system. If a value jumps erratically, the sensor or its wire is the better candidate. On real overheating, shut off and do not ride on.

Related topics

• Used Yamaha SuperJet: Freestyle or Racing? Check the Hours
• Yamaha SuperJet: Season Start Check with Battery and Service Reset
• 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.