300/440/550 js550 with 440 pump

[techr4life]

so i was goin over one of our js550s with my dad that he got from his friend back in the 90s and he was saying that one of the skis has a 440 pump with a stainless prop because it made it go faster... does neone have any insight as to if this is true or not and how i will tell if it is actually a 440 pump?

ne help would be great
~Luke

 

[Ĥölënböt]

440 pump has the impeller attached to the drive shaft and the 440 pump is sposed to be better for top end but its still arguable a friend of mine gps'd his ski with a 440 pump then put a 550 pump n it same impeller pitch and it was 3 mph faster top end but idk how accurate that experiment was
i run all 440 pumps what i go by is 550=bottom end and 440=top, but there are others who will tell you in wrong

 

[WFO Speedracer]

With plenty of rpms yes it is faster, but for 99% of the riding that most of us do you will be better off with a 550 pump.

 

[techr4life]

kewl thanks guys