Skeeters 550/750 swap - Page 3
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  1. #21
    PWCToday Regular
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by FOG View Post
    There is no dispute when it comes to 550 pumps vs 750 pumps in a JS hull. Performance increase is a given. However, if there are budget concerns, I have a few thoughts.

    First, once you add up the cost of parts for the swap, don't forget to account for all the incidental expenses that will most likely arise. When I look back on my conversion builds of the last twenty years, those nickle-and-dime costs often resulted in significant increase in the final cost.

    Keeping on the topic of budget, you might consider an approach that will eventually get you to where you want to be with your ski without too much immediate financial pain. Consider working with your existing 550 pump & driveline - for now. You can get your ski on the water, with awesome performance, and acquire what you need for pump conversion over a period of time. Perhaps next year, when you have all that you need for the swap, then proceed with that portion of your conversion.

    Working with what you have, you might want to consider new bearings and seals for both the driveline bearing box and the pump, especially if their condition is unknown. There is going to be more stress put on these components with the power increase.

    Aside from the bearing/seals expense, pull the trigger on a re-pitched impeller. Nineteen and 20-degree impellers are the popular choices. If you're going to crack the pump open for bearing/seals, then this is a great time to blueprint the pump. Simple hand tools and supplies can accomplish this. You can spend a couple of hours with files and abrasives and get good performance gain with very little cost.

    Bore the pump nozzle (or get an aftermarket). I use an oscillating spindle sander to bore my nozzles. A couple of bucks for grits and nozzle - done!

    You won't be disappointed with a properly configured 550 pump setup. Low end punch is great and top speed is amazing, high 40's to low 50's. And on these skinny hulls, that's a whole lot of fun!
    I have a decent idea of what I need to spend and itís really not much. Bought a water box last night, need a impeller probably going with a 20. And miscellaneous small stuff like pisser, gas line, cooling line, should have everything else.

    I also have all the extra parts needed to do the 750 pump swap, just need to dish the dough out for the kit from rhass.

    What does a blue printed pump consist of? Just smoothing out the inside?

    And what size nozzle is popular to bore it to?

    I have never really understood blue printing and nozzle boring and what itís actually doing for performance.


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  2. #22
    Top Dog FOG's Avatar
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    Re: Skeeters 550/750 swap

    Check out my build thread, posts #204 and #214.

    Blueprinting the pump is just removing excess casting material, cleaning up the vanes, and smoothing the flow surfaces. Boring the nozzle allows more water to exit the pump. The two stage 550 pump builds a lot of pressure at the nozzle so opening it up compensates for the significant increase in flow/pressure from the increase in impeller pitch. I opened up my nozzle to 69mm.

    I have not done a 750 pump swap in any of my conversions so I'll let those who have chime in on their experiences/recommendations.
    I'll quit before I sit~~~

  3. #23
    PWCToday.com Is My Home Away From Home BLRider's Avatar
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    Re: Skeeters 550/750 swap

    I was pretty impressed with my cleaned up 550 pump and 20į impeller. The setup is pretty worthy and with the 750 pump kits costing $500 - $800 by the time you're done, the 550 pump is worth it to get on the water.
    Never argue with an idiot, they will drag you down to their level then beat you with experience.

  4. #24
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by FOG View Post
    Check out my build thread, posts #204 and #214.

    Blueprinting the pump is just removing excess casting material, cleaning up the vanes, and smoothing the flow surfaces. Boring the nozzle allows more water to exit the pump. The two stage 550 pump builds a lot of pressure at the nozzle so opening it up compensates for the significant increase in flow/pressure from the increase in impeller pitch. I opened up my nozzle to 69mm.

    I have not done a 750 pump swap in any of my conversions so I'll let those who have chime in on their experiences/recommendations.
    Ski sounds good fog. Getting me amped up to ride mine.

    And ok thatíll probably be my route for right now.
    I have a pump with a few chipped veins at the ends I donít even know if itís worth using?

    I do have another 550 pump that was recently rebuilt on another 550 ski I have been wanting to try a 440 pump on anyways

    So I could also use that one.


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  5. #25
    PWCToday Regular
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    Re: Skeeters 550/750 swap

    Quote Originally Posted by BLRider View Post
    I was pretty impressed with my cleaned up 550 pump and 20į impeller. The setup is pretty worthy and with the 750 pump kits costing $500 - $800 by the time you're done, the 550 pump is worth it to get on the water.
    Ya the conversion ainít cheap. Would like to get this thing out on the water before summer is over. What kinda top speed were you getting with your set up blrider?


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  6. #26
    PWCToday Regular
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    Re: Skeeters 550/750 swap

    Havenít been able to work on the ski much but I did pick up a 750 ssxi

    Traded it for a dodge pick up I had and 800$ The dodge had a tranny that was going out and an assortment of problems. 233k miles.

    Jet ski is in good condition it seems gonna junk the hull most likely has a crack in the bottom.

    Keep the motor pump and electronics.

    Also picked up a factory water box from bionic racing. Iím really good condition.






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