06-23-2014, 10:30 AM #1
speed loss on FX140 new pump old pump had a hole in the side
Hello jetski nerds
i am fixing my friend ski that had a bad pump " all of it "
new drive shaft , pump, wear ring shoe everything but transom plate.
ski top speed is 40mph i think 50 would be closer to real world
pumps sound good, hook up very good stock prop
what else could be damaged? motor has 350 hours but sound ok starts right up
06-23-2014, 03:15 PM #2
did you install the correct pitch? if is too big it will lose power and mph.
btw 59 to 60 mph is what you will see on that ski.
06-23-2014, 10:57 PM #3
If you do need to get another replacement impeller, a 12/18 Solas Concord is absolutely perfect on mine.
The dealership had replaced it with a Skat 13/19, but it was doing similar things to what yours sounds like.
06-24-2014, 12:09 AM #4
I don't think 59-60 but should be more then 40. Any chance you are actually doing more then 40 and just the speedo wheel is positioned wrong or damaged from the pump removal. Sometimes it's only the wheel.
06-24-2014, 10:28 AM #5
06-24-2014, 05:25 PM #6
tops out at 9500 rpm looking at air filter and spark plugs now
it a real 40 MPH GPS say so
06-24-2014, 06:01 PM #7
06-24-2014, 06:41 PM #8
the prop is stock marked 68n10
shop manual say i should be running at 10,000 RPM at full throttle
trouble shooting for loss of speed from the service manual
this is a stock ski that the pump exploded with many broken parts
06-24-2014, 06:51 PM #9
06-24-2014, 06:52 PM #10
also, unless the prop was purchase new from yamaha , how do you know if it had the right pitch and no one has mess with it?
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