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  1. #21
    PWCToday Newbie DudeWithAJet's Avatar
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    Re: 650sx best mods for low end

    I just test rode a new impeller that I had laying around, had good high end but poor low end and almost seemed like it was cavitation. I have a guesstimate of the prop pitch but it’s the stock style but it’s stainless. It also ran much hotter so I have to probably set up dual cooling

  2. #22
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    Re: 650sx best mods for low end

    Quote Originally Posted by DudeWithAJet View Post
    I just test rode a new impeller that I had laying around, had good high end but poor low end and almost seemed like it was cavitation. I have a guesstimate of the prop pitch but itís the stock style but itís stainless. It also ran much hotter so I have to probably set up dual cooling
    A single 3/8" line and fittings is more than enough.
    What exactly does the IJSBA do?

  3. #23
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 650sx best mods for low end

    Quote Originally Posted by DudeWithAJet View Post
    I just test rode a new impeller that I had laying around, had good high end but poor low end and almost seemed like it was cavitation.
    I have a guesstimate of the prop pitch but it’s the stock style but it’s stainless. It also ran much hotter so I have to probably set up
    dual cooling
    You made a poor choice.

    In order to avoid costly repairs, you need to recognize a problem.

    In this case your impeller and possibly your installation is the problem,
    not the cooling system.


    Bill M.

    Using impellers that are laying around, is often more like making a
    choice from the junk drawer. Good parts are on ski's, old, damaged
    parts are laying on a shelf.
    Horsepower == Speed, RPM != Speed



  4. #24
    Resident Guru bird's Avatar
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    Re: 650sx best mods for low end

    Quote Originally Posted by DudeWithAJet View Post
    I just test rode a new impeller that I had laying around, had good high end but poor low end and almost seemed like it was cavitation. I have a guesstimate of the prop pitch but it’s the stock style but it’s stainless. It also ran much hotter so I have to probably set up dual cooling
    Get that feeler gauge out. What pitch is the impeller? Show us some numbers.

    Did you silicone the pump in correctly? 650 pumps are a pain compared to 750/800 pumps.

    Cavitation will make your engine run hot.
    Last edited by bird; 10-08-2021 at 08:51 AM.
    Third Coast Freeride - Midwest Wave Warriors

    Wooka Wooka Wookay. Let's Fing Rage!

  5. #25
    PWCToday Newbie DudeWithAJet's Avatar
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    Re: 650sx best mods for low end

    I believe I silicones the pump in correctly, I used a 15 pitch and believe it’s a skat trac, it was pretty chewed up and had to fix it. I tried putting in another pump from a ts and ran it in the water on the trailer. Similar results. So far 2 stock props and 1 aftermarket one and none have a good flow rate and the engine is getting pretty toasty. I ran it on the hose it and was ice cold so I’m almost certain it’s the impeller

  6. #26
    Resident Guru bird's Avatar
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    Re: 650sx best mods for low end

    Good Marine Silicone needs 48hrs to fully set after you install the pump. You only need to silicone the pump into the tunnel. Do not silicone the intake grate or ride plate.

    Do you know what a feeler gauge is? Get one.
    71VDiXHmvzL._AC_SS450_.jpg

    You need check the gap between the impeller edge and the pump wear ring.
    clearance.png
    I replaced my wear ring in my 750/800 pumps. It was quite easy, just need a press.
    https://www.ebay.com/itm/203500708756
    Last edited by bird; 10-11-2021 at 09:15 AM.
    Third Coast Freeride - Midwest Wave Warriors

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  7. #27
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: 650sx best mods for low end

    Choosing an impeller that is too aggressive will also make you engine run hot and can lead to deto
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  8. #28
    PWCToday Newbie DudeWithAJet's Avatar
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    Re: 650sx best mods for low end

    I have a feeler guage. It is indeed a 15 pitch prop. I concluded that the engine is not getting too hot, 2 pumps and 3 impellers and yielded to the same results. I’m thinking that it just looks like it’s not getting enough water because the pisser was an aftermarket one from the previous owner. The engine is pretty hot to the touch but not anywhere close to discoloration or boiling water. I might look into making the flow better in the future but for now it works pretty good

  9. #29
    PWCToday Newbie DudeWithAJet's Avatar
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    Re: 650sx best mods for low end

    I tried putting on the manifold from a ts that I had laying around. Didnít do too much but thanks for the suggestion. Next thing Iíll do over the winter is dry pipe

  10. #30
    PWCToday.com Is My Home Away From Home fastgtfairlane's Avatar
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    Re: 650sx best mods for low end

    the only way to know the actual pitch is to check it with a pitch gauge. just because it says 15 or 16 doesnt actually mean thats the actual pitch. i bought a 16 skat for a 550 and had a fully built setup, more than enough to pull the impeller, yet it was a total dog! had it checked and it was 18 degrees on the leading edge of 2 blades, 17 on the other and 16 on the trailing edge. definitely too much for a 550 engine. after repitching it, the ski ran much much better.
    96 superjet- rockered, -4, wide tray, adjustable footholds, kv148 mag setback pump, skat 7/14 impeller, rrp adjustable pole, blowsion ovp steering, 62t/62t, ada head, zeel A02T cdi, dual 44s, boysen power reeds, TNT SS chamber

    93-x2, newmiller ported SP750, milled head, R&D single 46 intake, sbn46, fpp blaster chamber pipe, hooker 9/15, umi, rhaas squirrel cage, dakine foot straps

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