Yamaha FX140 No Longer Reaches Top Speed

Used to be around 80 km/h, now just over 50: that is how FX140 owners describe the power drop in forums. A diagnostic tool does not clear everything but separates electronics from mechanics. M-JET DIAGNOSTIC shows you what the engine sees internally.

What you look at

• Engine speed at full throttle: does the engine reach its top RPM?
• Intake pressure and throttle position under full load
• Engine temperature: does a protection function intervene?
• Fault memory for sensor faults

Engine speed decides

If the engine reaches top RPM but the craft does not get faster, the problem is more likely in pump, impeller or intake, that is, in the mechanics. If RPM already falls short, fault memory, temperature as well as intake pressure and throttle help. With the data logger you record a test ride and know where to look next before you order parts.

Related topics

• Yamaha FX140 Won't Start, Starter Turns
• Buying a Used Yamaha FX140: Really Check the Operating Hours
• 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.