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Discussion Starter #1
Own two Yamaha FX140s... 2006 & 2007... Analog and digital speedometer readouts (2 separate displays on multimeter dash) do not read close to same speed. Have compared speed of my Yamaha's with a friend's jet ski and this shows analog (round) gauge is tracking at accurate speed. Digital gauge reads much higher... when analog gauge is 40mph digital gauge reads ~ 55/60. Could this a set-up issue? Reading maint. manual and I could not see any way to calibrate/adjust either gauge... only one speed sensor/wheel in rear of Yamaha so both gauges must be getting same voltage signal right? Love these jet skis but wish it were possible to just set Analog Speedometer for MPH and digital gauge for RPM... I can't see benefit of having two concurent Speedometer readouts. Both have done this since purchasing units new -- dealer thought speedometer sensor might just need to be broken in... Hours on units now are ~60 and 80 hours. Any suggestions?
 

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These speed sensors are never accurate. Really nothing you can do about it. Its weird when you install riva and worx ride plates to most skis, the speedometer says it is going a heap faster when its gain is minimal. 2 skis exactly the same going exactly the same speed will have 2 different read outs on the dash. The only way to get a good readout is with a GPS.
 

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Discussion Starter #3
Even if PWC speedometers are not too accurate... shouldn't the dual (analog and digital) speedometers on FX140 multi-meter read the same since there is only one speed sensor on the PWC? Same thing occurs on RPM settings... both analog and digital gauges on multi-meter dash don't read the same...
 

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The analogue is read directly in real time through the sensor. The digital relays through the cdi which means it will be delayed. Yamaha should have never put both on the ski, makes us techs pull our hair out because the owners expect it to be perfect, but theres really nothing that can be done. If there was only one on the ski it wouldnt even be an issue, no one would even notice.
 
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