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  1. #1
    Rick370's Avatar
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    Feb 2009
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    Lake St. Clair - Michigan
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    Looking for suggestions for stock S200 370HP performance upgrade

    After a couple of years of running stock, I think I'm ready for some mild performance upgrades. I've been going through alot of threads and most show upgrades to 430HP boats. I have the 2005 370HP and am not sure what upgrades are OK for my set up. I would like to squeeze past the 60 mark if possible. Let me know if anyone has any suggestions. First upgrade is to go with the steel washers. Guess I have been lucky so far.


  2. #2
    King_Of_Fun's Avatar
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    Jul 2007
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    Catawba Island, Ohio
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    2,703
    If the 185-hp engines are the same as the ski engines (and I have no reason to think that they aren't) then they have cast pistons instead of forged pistons - and that is going to be your limiting factor. Checkout JPEconsult's thread on the Sea Doo jetski Performance forum to get an idea of what mods can be done to this engine. Among other things, he changed the pistons, ECU, flywheel, SC, driveshaft, pump, impeller and added a external IC and RRFPR. You could do the same thing, but it would cost twice the money... Ron

  3. #3
    Rick370's Avatar
    Join Date
    Feb 2009
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    Lake St. Clair - Michigan
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    11
    Thanks for the reply, but I'm looking for minor stuff like swapping out the impellers, air intake mods, etc. Nothing in terms of changing engine parts for the most part

  4. #4
    1Make sure the air intakes are free flowing kn air filters ,4 in.,etc. 2 Change the impellors on the pumps and if you motors have intercoolers then maybe upgrade those ,just cooling the air going in the s/c more efficiently makes more horsepower. Good luck.

  5. #5
    JFizzleJR's Avatar
    Join Date
    Aug 2005
    Location
    FL
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    8,628
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    808
    You'll need 2 of these:

    http://www.4-tecperformance.com/inde...roducts_id=520

    And these:

    http://www.4-tecperformance.com/inde...roducts_id=983

    And these:

    http://www.4-tecperformance.com/inde...roducts_id=363

    Make your own custom 4" air intakes. I'm not sure what prop matches these mods on a boat.

    This will get you to your maximum potential on your 185 HP engines without changing internal parts or blowing things up. And they are the best 'bang for the buck' options available as well.

    You may be able to save a bunch on props and injectors. 42#'ers and 14/19r props (and less often 15/20r's) come up often in the classifieds.

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