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  1. 10-21-2019, 08:33 AM #1
    Jcbanjo02
    Jcbanjo02 is offline
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    200efi bottom end troubles

    S/N OT263673
    2001 200 efi
    idles fine
    Mid/top end seems good but is a dog getting out of the hole. Compression is 124-125 across all, 25 pitch tempest, brand new power head (no bottom end problem before new power head put on), injectors cleaned and flowed. Fuel pressure is good, any ideas?
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  2. lpugh
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    #2 10-21-2019, 09:16 AM
    Wrong prop or not vented correctly
    Thank You Leon Pugh
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  3. Jcbanjo02
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    #3 10-21-2019, 11:10 AM
    Add or take out vent plugs?
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  4. FISHON317
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    #4 11-07-2019, 05:47 AM
    1998 Mercury 200efi, I run a 24 tempest with 1 plug out 2 in with small holes. Runs great
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  5. EuropeanAM
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    #5 11-07-2019, 11:47 AM
    Factory Reman powerhead, Aftermarket Reman, or Built by your Tech?

    Checked to make sure it's actually reaching WOT at the engine?

    Who did the injectors?

    Reeds changed?


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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