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  1. #1
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    200 opti sport jet losses rpm after 6-10 seconds

    at WOT gets 5700 rpm for 6-7 seconds then drops to 5000

    cleaned injectors
    new reeds
    gone thru compressor
    checked tracer valve, regulators etc
    fuel pressure 95/105
    air pressure dead headed 128 psi
    cleaned air injectors fuel injectors replaced 1 cyl that tested low flow
    fuel pumps test good

    has spark on all 6
    swapped crank sensor with known good

    can cyl drop test at speed no effect on cyl 5 or 6 above 3500 rpm exept within first attempt at WOT where its holding 5700 before it falls to 5k


    cyl 6 has the new set of injectors and has been issue since beginning..



    missing something seems sensor or electrical as mechanicals are sound running out of ideas here

    4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she


    things that were are no longer as they are today...

  2. #2
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    I'd try a coil on # 5 or 6 . Also take a good look at the 5 pin where the harness plugs into the coil. We have seen them melt together there. If you have a temp gun ,I like to check the coil temps ,it's a good way to see if anyone is dead . Are you looking at air and fuel psi at wot ? Have you looked into the jet pump stator veins and impeller ? Make sure the shift gate is not dropping down a little at wot . hf ...

  3. #3
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    change the plugs next. they can some times act erroric[sp] under pressure. been there.

  4. #4
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    Fuel vent clogged or fuel restriction of some kind maybe. Put a vacuum gauge inline where the fuel line hooks up to the engine. more than 3 - 4 inches of vacuum will make it starve.
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

  5. #5
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    Check the map sensor/load sensor. A issue with one cylinder can through the reading erratic. Or tap test it to see if the piezoelectric board broke.

    stuck float in the vst? If you were carb I would say it’s acting like over rich idle loading up the crankcase. Then burning it off for a second when the hammers down.

    Another option is cavitation water falsely boosting rpm then your planed off lift and gain clean flow. Is their a noticeable speed change when rpm drop.
    Last edited by Motv18; 03-20-2018 at 08:19 AM.

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