to low on Topspeed ??? SX-R 1100
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  1. #1
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    to low on Topspeed ??? SX-R 1100

    My Setup is:

    83.00mm = 1150cc
    44mm Mikunis
    Solas 15/24 w/ OEM Pump
    Dual cooling
    ADA Head with 155 PSI 30cc domes
    Dry Pipe Mods
    Advanced ing. Mods
    drilled Stinger Jet to 1.7mm
    Spark Plugs are Dark Brown to light Black

    Pro Watercraft Rideplate
    Front sponsons
    Rear Sponsons
    Worx Dual Scope Intake Grate


    Get 57 mp/h @ 7200 rp/m
    iŽam 250 LBS

    What to do next to reach 60 mp/h or even more. THX
    Last edited by Felix #86; 11-04-2022 at 04:36 AM.

  2. #2
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    Re: to low on Topspeed ??? SX-R 1100

    Easiest way to make boats go faster is to lighten them. I am 260, my son is 190, my daughter is 130. (wife does not ride) Which of us do you suppose can make it go faster? I am not trying to be a smart a** here. I am just saying those last 3 mph you are looking for are exponentially more difficult to achieve than the previous 3mph you may have gained with your modifications. Put someone lighter on it and see how fast if goes!

    There is a thread on here in regard to your question... http://www.pwctoday.com/showthread.php?t=362323

    Good Luck
    2, 1998 TS 770 L, restored and running great as of July 2019 (NO THANKS to the person at SBT, who put the WRONG crankshaft bearing into the rebuilt engine I got from them)

  3. #3
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    Re: to low on Topspeed ??? SX-R 1100

    yes thats for sure true
    But maybe iŽam missing something on my Build...

    PS: the Block and the Zylinder doesnŽt have any Porting

  4. #4
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: to low on Topspeed ??? SX-R 1100

    Some nice porting will DEFINATELY make more power.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  5. #5
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    Re: to low on Topspeed ??? SX-R 1100

    What is the MAX RPM for that engine? It does not matter how much power you have if your engine is already at max RPM. IF you are at near max RPM, you may need to tune up your pump. My experience is from the 70's with drag racing and jet boats. We could make all kinds of horsepower with engines, but all that power does not matter unless you can get it hooked to the water. When you start pushing limits, it is all a balancing act.

    These days I just want them to start and run correctly, everytime!
    2, 1998 TS 770 L, restored and running great as of July 2019 (NO THANKS to the person at SBT, who put the WRONG crankshaft bearing into the rebuilt engine I got from them)

  6. #6
    Top Dog JC-SuperJet's Avatar
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    Re: to low on Topspeed ??? SX-R 1100

    +1 Hemjo Post #2

    When you add a heavier Engine to a Hull designed for a smaller lighter Engine, the Hull will ride lower in the Water and the Drag Forces will increase substantially, thereby reducing the Top Speed.

    And if a Heavy Pilot is added, the Hull will sink even lower, resulting in even more Drag and reduced Top Speed.

    I installed a Group K Ported YAM 1200 Triple in my 2012 Super Jet and it only went 56 mph. Then I installed a Non-Ported Limited KAW 1100 Triple in the same Super Jet and it only reached 57 mph. I'm guessing that the additional Engine Weight caused to Hull to ride lower in the Water, generating more resistance and plowing more.

    Having said all that, the KAW 1100 Engine should be hitting 7500 rpm when tuned optimally. That's 3 mph short. Rule of Thumb: 100 RPM = 1 MPH.

    By your Plug description, it seems that the Engine is running Rich. It's safe but not as fast as it could be...

    If you do 100 foot WOT speed runs with the Tachometer, the Engine shouldn't seize while your testing for max RPMs. Once you find MAX RPMS, open the Carb Hi Speed Screws +1/8 Turn for safe Engine Carburetion.

    Also, try installing a smaller Main Jet into the Stinger. The recommended size is #120 and you have #170. Test with a #150 and see what happens.

    Remember, with a smaller Main Jet in the Stinger, the Exhaust Gases will run hotter and the Carbs may need to provide more Fuel to cool the Pistons.

    I would test a smaller Stinger Main Jet, then monitor RPMs and Spark Color, then adjust Carbs as needed.
    Last edited by JC-SuperJet; 11-04-2022 at 01:07 PM.

  7. #7
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    Re: to low on Topspeed ??? SX-R 1100

    ok thanks for the infos. by the way is 1.7mm #170 Jet ???
    I want an safe rec setup not looking for the last edge but when some here run 63+ i want to go 60 even at least

    i will check an other impeller to see what rpm i can increase

    i run 15/24 at the moment i will try 13/23

  8. #8
    Top Dog JC-SuperJet's Avatar
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    Re: to low on Topspeed ??? SX-R 1100

    Mikuni Jets are Metric.

    So #200 is 2.0 mm, #170 is 1.70 mm, etc.

  9. #9
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    Re: to low on Topspeed ??? SX-R 1100

    ok i understand. thanks so i need to try #150 is the difference so big ?

    I do run an seadoo 2Stroke Oil Filter before that Stingers-l500.jpg
    Last edited by Felix #86; 11-05-2022 at 07:43 AM.

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